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Finding the Fourth Proportional to 925.76, 1,387.92 and 438.56

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Solution

The fourth proportional to 925.76, 1,387.92 and 438.56 is: 657.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.76 : 1,387.92 = 438.56 : x
  2. Step 2: Convert to fraction form
    925.76/1,387.92 = 438.56/x
  3. Step 3: Cross multiply
    925.76x = 1,387.92 × 438.56
  4. Step 4: Simplify right side
    925.76x = 608,686.20
  5. Step 5: Solve for x
    x = 608,686.20/925.76
  6. Step 6: Final answer
    x = 657.50

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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.