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Finding the Fourth Proportional to 691.28, 954.09 and 396.74

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Solution

The fourth proportional to 691.28, 954.09 and 396.74 is: 547.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.28 : 954.09 = 396.74 : x
  2. Step 2: Convert to fraction form
    691.28/954.09 = 396.74/x
  3. Step 3: Cross multiply
    691.28x = 954.09 × 396.74
  4. Step 4: Simplify right side
    691.28x = 378,520.90
  5. Step 5: Solve for x
    x = 378,520.90/691.28
  6. Step 6: Final answer
    x = 547.57

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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.