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Finding the Fourth Proportional to 691.25, 1,036.24 and 631.13

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Solution

The fourth proportional to 691.25, 1,036.24 and 631.13 is: 946.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.25 : 1,036.24 = 631.13 : x
  2. Step 2: Convert to fraction form
    691.25/1,036.24 = 631.13/x
  3. Step 3: Cross multiply
    691.25x = 1,036.24 × 631.13
  4. Step 4: Simplify right side
    691.25x = 654,002.15
  5. Step 5: Solve for x
    x = 654,002.15/691.25
  6. Step 6: Final answer
    x = 946.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.