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Finding the Fourth Proportional to 80,980.60, 121,418.10 and 72,686.20

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Solution

The fourth proportional to 80,980.60, 121,418.10 and 72,686.20 is: 108,981.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,980.60 : 121,418.10 = 72,686.20 : x
  2. Step 2: Convert to fraction form
    80,980.60/121,418.10 = 72,686.20/x
  3. Step 3: Cross multiply
    80,980.60x = 121,418.10 × 72,686.20
  4. Step 4: Simplify right side
    80,980.60x = 8,825,420,300.22
  5. Step 5: Solve for x
    x = 8,825,420,300.22/80,980.60
  6. Step 6: Final answer
    x = 108,981.91

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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.