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Finding the Fourth Proportional to 687,440.51, 948,782.00 and 400,960.59

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Solution

The fourth proportional to 687,440.51, 948,782.00 and 400,960.59 is: 553,392.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,440.51 : 948,782.00 = 400,960.59 : x
  2. Step 2: Convert to fraction form
    687,440.51/948,782.00 = 400,960.59/x
  3. Step 3: Cross multiply
    687,440.51x = 948,782.00 × 400,960.59
  4. Step 4: Simplify right side
    687,440.51x = 380,424,191,797.72
  5. Step 5: Solve for x
    x = 380,424,191,797.72/687,440.51
  6. Step 6: Final answer
    x = 553,392.17

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.