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Finding the Fourth Proportional to 731.49, 1,009.20 and 436.65

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Solution

The fourth proportional to 731.49, 1,009.20 and 436.65 is: 602.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.49 : 1,009.20 = 436.65 : x
  2. Step 2: Convert to fraction form
    731.49/1,009.20 = 436.65/x
  3. Step 3: Cross multiply
    731.49x = 1,009.20 × 436.65
  4. Step 4: Simplify right side
    731.49x = 440,667.18
  5. Step 5: Solve for x
    x = 440,667.18/731.49
  6. Step 6: Final answer
    x = 602.42

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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.