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Finding the Fourth Proportional to 80,999.20, 121,498.80 and 77,718.70

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Solution

The fourth proportional to 80,999.20, 121,498.80 and 77,718.70 is: 116,578.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,999.20 : 121,498.80 = 77,718.70 : x
  2. Step 2: Convert to fraction form
    80,999.20/121,498.80 = 77,718.70/x
  3. Step 3: Cross multiply
    80,999.20x = 121,498.80 × 77,718.70
  4. Step 4: Simplify right side
    80,999.20x = 9,442,728,787.56
  5. Step 5: Solve for x
    x = 9,442,728,787.56/80,999.20
  6. Step 6: Final answer
    x = 116,578.05

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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.