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Finding the Fourth Proportional to 925.57, 1,387.13 and 438.76

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Solution

The fourth proportional to 925.57, 1,387.13 and 438.76 is: 657.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.57 : 1,387.13 = 438.76 : x
  2. Step 2: Convert to fraction form
    925.57/1,387.13 = 438.76/x
  3. Step 3: Cross multiply
    925.57x = 1,387.13 × 438.76
  4. Step 4: Simplify right side
    925.57x = 608,610.22
  5. Step 5: Solve for x
    x = 608,610.22/925.57
  6. Step 6: Final answer
    x = 657.56

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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.