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Finding the Fourth Proportional to 687.74, 948.56 and 477.92

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Solution

The fourth proportional to 687.74, 948.56 and 477.92 is: 659.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.74 : 948.56 = 477.92 : x
  2. Step 2: Convert to fraction form
    687.74/948.56 = 477.92/x
  3. Step 3: Cross multiply
    687.74x = 948.56 × 477.92
  4. Step 4: Simplify right side
    687.74x = 453,328.66
  5. Step 5: Solve for x
    x = 453,328.66/687.74
  6. Step 6: Final answer
    x = 659.15

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Double scale
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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.