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Finding the Fourth Proportional to 80,861.60, 121,292.40 and 78,557.60

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Solution

The fourth proportional to 80,861.60, 121,292.40 and 78,557.60 is: 117,836.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,861.60 : 121,292.40 = 78,557.60 : x
  2. Step 2: Convert to fraction form
    80,861.60/121,292.40 = 78,557.60/x
  3. Step 3: Cross multiply
    80,861.60x = 121,292.40 × 78,557.60
  4. Step 4: Simplify right side
    80,861.60x = 9,528,439,842.24
  5. Step 5: Solve for x
    x = 9,528,439,842.24/80,861.60
  6. Step 6: Final answer
    x = 117,836.40

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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.