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Finding the Fourth Proportional to 681.01, 938.18 and 515.16

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Solution

The fourth proportional to 681.01, 938.18 and 515.16 is: 709.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.01 : 938.18 = 515.16 : x
  2. Step 2: Convert to fraction form
    681.01/938.18 = 515.16/x
  3. Step 3: Cross multiply
    681.01x = 938.18 × 515.16
  4. Step 4: Simplify right side
    681.01x = 483,314.10
  5. Step 5: Solve for x
    x = 483,314.10/681.01
  6. Step 6: Final answer
    x = 709.70

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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.