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Finding the Fourth Proportional to 691.47, 954.21 and 376.73

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Solution

The fourth proportional to 691.47, 954.21 and 376.73 is: 519.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.47 : 954.21 = 376.73 : x
  2. Step 2: Convert to fraction form
    691.47/954.21 = 376.73/x
  3. Step 3: Cross multiply
    691.47x = 954.21 × 376.73
  4. Step 4: Simplify right side
    691.47x = 359,472.88
  5. Step 5: Solve for x
    x = 359,472.88/691.47
  6. Step 6: Final answer
    x = 519.87

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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.