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Finding the Fourth Proportional to 107,115.50, 160,447.20 and 85,940.90

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Solution

The fourth proportional to 107,115.50, 160,447.20 and 85,940.90 is: 128,729.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,115.50 : 160,447.20 = 85,940.90 : x
  2. Step 2: Convert to fraction form
    107,115.50/160,447.20 = 85,940.90/x
  3. Step 3: Cross multiply
    107,115.50x = 160,447.20 × 85,940.90
  4. Step 4: Simplify right side
    107,115.50x = 13,788,976,972.77
  5. Step 5: Solve for x
    x = 13,788,976,972.77/107,115.50
  6. Step 6: Final answer
    x = 128,729.99

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1.5x scale

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.