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Finding the Fourth Proportional to 691.62, 954.48 and 396.88

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Solution

The fourth proportional to 691.62, 954.48 and 396.88 is: 547.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.62 : 954.48 = 396.88 : x
  2. Step 2: Convert to fraction form
    691.62/954.48 = 396.88/x
  3. Step 3: Cross multiply
    691.62x = 954.48 × 396.88
  4. Step 4: Simplify right side
    691.62x = 378,814.02
  5. Step 5: Solve for x
    x = 378,814.02/691.62
  6. Step 6: Final answer
    x = 547.72

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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.