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Finding the Fourth Proportional to 80,856.60, 121,284.90 and 72,400.20

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Solution

The fourth proportional to 80,856.60, 121,284.90 and 72,400.20 is: 108,600.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,856.60 : 121,284.90 = 72,400.20 : x
  2. Step 2: Convert to fraction form
    80,856.60/121,284.90 = 72,400.20/x
  3. Step 3: Cross multiply
    80,856.60x = 121,284.90 × 72,400.20
  4. Step 4: Simplify right side
    80,856.60x = 8,781,051,016.98
  5. Step 5: Solve for x
    x = 8,781,051,016.98/80,856.60
  6. Step 6: Final answer
    x = 108,600.30

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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.