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Finding the Fourth Proportional to 925.62, 1,387.97 and 405.39

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Solution

The fourth proportional to 925.62, 1,387.97 and 405.39 is: 607.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.62 : 1,387.97 = 405.39 : x
  2. Step 2: Convert to fraction form
    925.62/1,387.97 = 405.39/x
  3. Step 3: Cross multiply
    925.62x = 1,387.97 × 405.39
  4. Step 4: Simplify right side
    925.62x = 562,671.05
  5. Step 5: Solve for x
    x = 562,671.05/925.62
  6. Step 6: Final answer
    x = 607.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.