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Finding the Fourth Proportional to 925.47, 1,387.80 and 438.66

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Solution

The fourth proportional to 925.47, 1,387.80 and 438.66 is: 657.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.47 : 1,387.80 = 438.66 : x
  2. Step 2: Convert to fraction form
    925.47/1,387.80 = 438.66/x
  3. Step 3: Cross multiply
    925.47x = 1,387.80 × 438.66
  4. Step 4: Simplify right side
    925.47x = 608,772.35
  5. Step 5: Solve for x
    x = 608,772.35/925.47
  6. Step 6: Final answer
    x = 657.80

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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.