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Finding the Fourth Proportional to 731.44, 1,009.39 and 436.70

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Solution

The fourth proportional to 731.44, 1,009.39 and 436.70 is: 602.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.44 : 1,009.39 = 436.70 : x
  2. Step 2: Convert to fraction form
    731.44/1,009.39 = 436.70/x
  3. Step 3: Cross multiply
    731.44x = 1,009.39 × 436.70
  4. Step 4: Simplify right side
    731.44x = 440,800.61
  5. Step 5: Solve for x
    x = 440,800.61/731.44
  6. Step 6: Final answer
    x = 602.65

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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.