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Finding the Fourth Proportional to 80,679.60, 121,019.40 and 77,266.80

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Solution

The fourth proportional to 80,679.60, 121,019.40 and 77,266.80 is: 115,900.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,679.60 : 121,019.40 = 77,266.80 : x
  2. Step 2: Convert to fraction form
    80,679.60/121,019.40 = 77,266.80/x
  3. Step 3: Cross multiply
    80,679.60x = 121,019.40 × 77,266.80
  4. Step 4: Simplify right side
    80,679.60x = 9,350,781,775.92
  5. Step 5: Solve for x
    x = 9,350,781,775.92/80,679.60
  6. Step 6: Final answer
    x = 115,900.20

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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.