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Finding the Fourth Proportional to 80,600.10, 120,900.15 and 77,187.30

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Solution

The fourth proportional to 80,600.10, 120,900.15 and 77,187.30 is: 115,780.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,600.10 : 120,900.15 = 77,187.30 : x
  2. Step 2: Convert to fraction form
    80,600.10/120,900.15 = 77,187.30/x
  3. Step 3: Cross multiply
    80,600.10x = 120,900.15 × 77,187.30
  4. Step 4: Simplify right side
    80,600.10x = 9,331,956,148.10
  5. Step 5: Solve for x
    x = 9,331,956,148.10/80,600.10
  6. Step 6: Final answer
    x = 115,780.95

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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.