Home / 1,129.15-1,691.85-1,086.49

Finding the Fourth Proportional to 1,129.15, 1,691.85 and 1,086.49

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Solution

The fourth proportional to 1,129.15, 1,691.85 and 1,086.49 is: 1,627.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.15 : 1,691.85 = 1,086.49 : x
  2. Step 2: Convert to fraction form
    1,129.15/1,691.85 = 1,086.49/x
  3. Step 3: Cross multiply
    1,129.15x = 1,691.85 × 1,086.49
  4. Step 4: Simplify right side
    1,129.15x = 1,838,178.11
  5. Step 5: Solve for x
    x = 1,838,178.11/1,129.15
  6. Step 6: Final answer
    x = 1,627.93

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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.