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Finding the Fourth Proportional to 691.17, 953.80 and 396.42

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Solution

The fourth proportional to 691.17, 953.80 and 396.42 is: 547.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.17 : 953.80 = 396.42 : x
  2. Step 2: Convert to fraction form
    691.17/953.80 = 396.42/x
  3. Step 3: Cross multiply
    691.17x = 953.80 × 396.42
  4. Step 4: Simplify right side
    691.17x = 378,105.40
  5. Step 5: Solve for x
    x = 378,105.40/691.17
  6. Step 6: Final answer
    x = 547.05

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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.