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Finding the Fourth Proportional to 731.68, 1,009.38 and 421

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Solution

The fourth proportional to 731.68, 1,009.38 and 421 is: 580.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.68 : 1,009.38 = 421 : x
  2. Step 2: Convert to fraction form
    731.68/1,009.38 = 421/x
  3. Step 3: Cross multiply
    731.68x = 1,009.38 × 421
  4. Step 4: Simplify right side
    731.68x = 424,948.98
  5. Step 5: Solve for x
    x = 424,948.98/731.68
  6. Step 6: Final answer
    x = 580.79

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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.