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Finding the Fourth Proportional to 502.18, 691.47 and 439.66

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Solution

The fourth proportional to 502.18, 691.47 and 439.66 is: 605.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    502.18 : 691.47 = 439.66 : x
  2. Step 2: Convert to fraction form
    502.18/691.47 = 439.66/x
  3. Step 3: Cross multiply
    502.18x = 691.47 × 439.66
  4. Step 4: Simplify right side
    502.18x = 304,011.70
  5. Step 5: Solve for x
    x = 304,011.70/502.18
  6. Step 6: Final answer
    x = 605.38

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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.