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Finding the Fourth Proportional to 143,917.40, 215,874.66 and 80,737.40

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Solution

The fourth proportional to 143,917.40, 215,874.66 and 80,737.40 is: 121,105.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,917.40 : 215,874.66 = 80,737.40 : x
  2. Step 2: Convert to fraction form
    143,917.40/215,874.66 = 80,737.40/x
  3. Step 3: Cross multiply
    143,917.40x = 215,874.66 × 80,737.40
  4. Step 4: Simplify right side
    143,917.40x = 17,429,158,774.28
  5. Step 5: Solve for x
    x = 17,429,158,774.28/143,917.40
  6. Step 6: Final answer
    x = 121,105.29

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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.