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Finding the Fourth Proportional to 865.64, 1,298.76 and 660.44

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Solution

The fourth proportional to 865.64, 1,298.76 and 660.44 is: 990.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.64 : 1,298.76 = 660.44 : x
  2. Step 2: Convert to fraction form
    865.64/1,298.76 = 660.44/x
  3. Step 3: Cross multiply
    865.64x = 1,298.76 × 660.44
  4. Step 4: Simplify right side
    865.64x = 857,753.05
  5. Step 5: Solve for x
    x = 857,753.05/865.64
  6. Step 6: Final answer
    x = 990.89

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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.