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Finding the Fourth Proportional to 974.32, 1,458.88 and 769.28

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Solution

The fourth proportional to 974.32, 1,458.88 and 769.28 is: 1,151.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.32 : 1,458.88 = 769.28 : x
  2. Step 2: Convert to fraction form
    974.32/1,458.88 = 769.28/x
  3. Step 3: Cross multiply
    974.32x = 1,458.88 × 769.28
  4. Step 4: Simplify right side
    974.32x = 1,122,287.21
  5. Step 5: Solve for x
    x = 1,122,287.21/974.32
  6. Step 6: Final answer
    x = 1,151.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.