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Finding the Fourth Proportional to 1,003.80, 1,385.82 and 689.52

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Solution

The fourth proportional to 1,003.80, 1,385.82 and 689.52 is: 951.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.80 : 1,385.82 = 689.52 : x
  2. Step 2: Convert to fraction form
    1,003.80/1,385.82 = 689.52/x
  3. Step 3: Cross multiply
    1,003.80x = 1,385.82 × 689.52
  4. Step 4: Simplify right side
    1,003.80x = 955,550.61
  5. Step 5: Solve for x
    x = 955,550.61/1,003.80
  6. Step 6: Final answer
    x = 951.93

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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.