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Finding the Fourth Proportional to 1,335.88, 2,003.37 and 686.53

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Solution

The fourth proportional to 1,335.88, 2,003.37 and 686.53 is: 1,029.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,335.88 : 2,003.37 = 686.53 : x
  2. Step 2: Convert to fraction form
    1,335.88/2,003.37 = 686.53/x
  3. Step 3: Cross multiply
    1,335.88x = 2,003.37 × 686.53
  4. Step 4: Simplify right side
    1,335.88x = 1,375,373.61
  5. Step 5: Solve for x
    x = 1,375,373.61/1,335.88
  6. Step 6: Final answer
    x = 1,029.56

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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.