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Finding the Fourth Proportional to 691.39, 954.07 and 396.60

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Solution

The fourth proportional to 691.39, 954.07 and 396.60 is: 547.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.39 : 954.07 = 396.60 : x
  2. Step 2: Convert to fraction form
    691.39/954.07 = 396.60/x
  3. Step 3: Cross multiply
    691.39x = 954.07 × 396.60
  4. Step 4: Simplify right side
    691.39x = 378,384.16
  5. Step 5: Solve for x
    x = 378,384.16/691.39
  6. Step 6: Final answer
    x = 547.28

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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.