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Finding the Fourth Proportional to 120,755.61, 181,166.22 and 85,916.70

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Solution

The fourth proportional to 120,755.61, 181,166.22 and 85,916.70 is: 128,898.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,755.61 : 181,166.22 = 85,916.70 : x
  2. Step 2: Convert to fraction form
    120,755.61/181,166.22 = 85,916.70/x
  3. Step 3: Cross multiply
    120,755.61x = 181,166.22 × 85,916.70
  4. Step 4: Simplify right side
    120,755.61x = 15,565,203,773.87
  5. Step 5: Solve for x
    x = 15,565,203,773.87/120,755.61
  6. Step 6: Final answer
    x = 128,898.39

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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.