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Finding the Fourth Proportional to 691.29, 953.96 and 396.61

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Solution

The fourth proportional to 691.29, 953.96 and 396.61 is: 547.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.29 : 953.96 = 396.61 : x
  2. Step 2: Convert to fraction form
    691.29/953.96 = 396.61/x
  3. Step 3: Cross multiply
    691.29x = 953.96 × 396.61
  4. Step 4: Simplify right side
    691.29x = 378,345.71
  5. Step 5: Solve for x
    x = 378,345.71/691.29
  6. Step 6: Final answer
    x = 547.30

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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.