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Finding the Fourth Proportional to 731.52, 1,009.08 and 644.40

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Solution

The fourth proportional to 731.52, 1,009.08 and 644.40 is: 888.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.52 : 1,009.08 = 644.40 : x
  2. Step 2: Convert to fraction form
    731.52/1,009.08 = 644.40/x
  3. Step 3: Cross multiply
    731.52x = 1,009.08 × 644.40
  4. Step 4: Simplify right side
    731.52x = 650,251.15
  5. Step 5: Solve for x
    x = 650,251.15/731.52
  6. Step 6: Final answer
    x = 888.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.