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Finding the Fourth Proportional to 932.39, 1,286.49 and 578.60

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Solution

The fourth proportional to 932.39, 1,286.49 and 578.60 is: 798.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.39 : 1,286.49 = 578.60 : x
  2. Step 2: Convert to fraction form
    932.39/1,286.49 = 578.60/x
  3. Step 3: Cross multiply
    932.39x = 1,286.49 × 578.60
  4. Step 4: Simplify right side
    932.39x = 744,363.11
  5. Step 5: Solve for x
    x = 744,363.11/932.39
  6. Step 6: Final answer
    x = 798.34

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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.