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Finding the Fourth Proportional to 914.04, 1,261.38 and 515.71

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Solution

The fourth proportional to 914.04, 1,261.38 and 515.71 is: 711.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.04 : 1,261.38 = 515.71 : x
  2. Step 2: Convert to fraction form
    914.04/1,261.38 = 515.71/x
  3. Step 3: Cross multiply
    914.04x = 1,261.38 × 515.71
  4. Step 4: Simplify right side
    914.04x = 650,506.28
  5. Step 5: Solve for x
    x = 650,506.28/914.04
  6. Step 6: Final answer
    x = 711.68

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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.