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Finding the Fourth Proportional to 1,335.15, 2,003.31 and 686.34

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Solution

The fourth proportional to 1,335.15, 2,003.31 and 686.34 is: 1,029.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,335.15 : 2,003.31 = 686.34 : x
  2. Step 2: Convert to fraction form
    1,335.15/2,003.31 = 686.34/x
  3. Step 3: Cross multiply
    1,335.15x = 2,003.31 × 686.34
  4. Step 4: Simplify right side
    1,335.15x = 1,374,951.79
  5. Step 5: Solve for x
    x = 1,374,951.79/1,335.15
  6. Step 6: Final answer
    x = 1,029.81

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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.