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Finding the Fourth Proportional to 691.71, 954.45 and 396.99

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Solution

The fourth proportional to 691.71, 954.45 and 396.99 is: 547.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.71 : 954.45 = 396.99 : x
  2. Step 2: Convert to fraction form
    691.71/954.45 = 396.99/x
  3. Step 3: Cross multiply
    691.71x = 954.45 × 396.99
  4. Step 4: Simplify right side
    691.71x = 378,907.11
  5. Step 5: Solve for x
    x = 378,907.11/691.71
  6. Step 6: Final answer
    x = 547.78

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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.