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Finding the Fourth Proportional to 728.60, 1,005 and 418.10

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Solution

The fourth proportional to 728.60, 1,005 and 418.10 is: 576.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.60 : 1,005 = 418.10 : x
  2. Step 2: Convert to fraction form
    728.60/1,005 = 418.10/x
  3. Step 3: Cross multiply
    728.60x = 1,005 × 418.10
  4. Step 4: Simplify right side
    728.60x = 420,190.50
  5. Step 5: Solve for x
    x = 420,190.50/728.60
  6. Step 6: Final answer
    x = 576.71

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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.