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Finding the Fourth Proportional to 925.35, 1,387.45 and 308.90

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Solution

The fourth proportional to 925.35, 1,387.45 and 308.90 is: 463.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.35 : 1,387.45 = 308.90 : x
  2. Step 2: Convert to fraction form
    925.35/1,387.45 = 308.90/x
  3. Step 3: Cross multiply
    925.35x = 1,387.45 × 308.90
  4. Step 4: Simplify right side
    925.35x = 428,583.31
  5. Step 5: Solve for x
    x = 428,583.31/925.35
  6. Step 6: Final answer
    x = 463.16

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1.5x scale

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.