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Finding the Fourth Proportional to 731.52, 1,009.60 and 416.80

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Solution

The fourth proportional to 731.52, 1,009.60 and 416.80 is: 575.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.52 : 1,009.60 = 416.80 : x
  2. Step 2: Convert to fraction form
    731.52/1,009.60 = 416.80/x
  3. Step 3: Cross multiply
    731.52x = 1,009.60 × 416.80
  4. Step 4: Simplify right side
    731.52x = 420,801.28
  5. Step 5: Solve for x
    x = 420,801.28/731.52
  6. Step 6: Final answer
    x = 575.24

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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.