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Finding the Fourth Proportional to 691.57, 1,038.03 and 539.15

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Solution

The fourth proportional to 691.57, 1,038.03 and 539.15 is: 809.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.57 : 1,038.03 = 539.15 : x
  2. Step 2: Convert to fraction form
    691.57/1,038.03 = 539.15/x
  3. Step 3: Cross multiply
    691.57x = 1,038.03 × 539.15
  4. Step 4: Simplify right side
    691.57x = 559,651.18
  5. Step 5: Solve for x
    x = 559,651.18/691.57
  6. Step 6: Final answer
    x = 809.25

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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.