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Finding the Fourth Proportional to 691.30, 953.96 and 396.55

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Solution

The fourth proportional to 691.30, 953.96 and 396.55 is: 547.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.30 : 953.96 = 396.55 : x
  2. Step 2: Convert to fraction form
    691.30/953.96 = 396.55/x
  3. Step 3: Cross multiply
    691.30x = 953.96 × 396.55
  4. Step 4: Simplify right side
    691.30x = 378,292.84
  5. Step 5: Solve for x
    x = 378,292.84/691.30
  6. Step 6: Final answer
    x = 547.22

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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.