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Finding the Fourth Proportional to 1,003.64, 1,385.22 and 724.82

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Solution

The fourth proportional to 1,003.64, 1,385.22 and 724.82 is: 1,000.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.64 : 1,385.22 = 724.82 : x
  2. Step 2: Convert to fraction form
    1,003.64/1,385.22 = 724.82/x
  3. Step 3: Cross multiply
    1,003.64x = 1,385.22 × 724.82
  4. Step 4: Simplify right side
    1,003.64x = 1,004,035.16
  5. Step 5: Solve for x
    x = 1,004,035.16/1,003.64
  6. Step 6: Final answer
    x = 1,000.39

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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.