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Finding the Fourth Proportional to 81,048.60, 121,520.10 and 72,754.20

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Solution

The fourth proportional to 81,048.60, 121,520.10 and 72,754.20 is: 109,083.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,048.60 : 121,520.10 = 72,754.20 : x
  2. Step 2: Convert to fraction form
    81,048.60/121,520.10 = 72,754.20/x
  3. Step 3: Cross multiply
    81,048.60x = 121,520.10 × 72,754.20
  4. Step 4: Simplify right side
    81,048.60x = 8,841,097,659.42
  5. Step 5: Solve for x
    x = 8,841,097,659.42/81,048.60
  6. Step 6: Final answer
    x = 109,083.90

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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.