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Finding the Fourth Proportional to 80,585.20, 120,877.80 and 78,857.20

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Solution

The fourth proportional to 80,585.20, 120,877.80 and 78,857.20 is: 118,285.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,585.20 : 120,877.80 = 78,857.20 : x
  2. Step 2: Convert to fraction form
    80,585.20/120,877.80 = 78,857.20/x
  3. Step 3: Cross multiply
    80,585.20x = 120,877.80 × 78,857.20
  4. Step 4: Simplify right side
    80,585.20x = 9,532,084,850.16
  5. Step 5: Solve for x
    x = 9,532,084,850.16/80,585.20
  6. Step 6: Final answer
    x = 118,285.80

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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.