Home / 86,629.60-129,944.40-81,380.80

Finding the Fourth Proportional to 86,629.60, 129,944.40 and 81,380.80

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Solution

The fourth proportional to 86,629.60, 129,944.40 and 81,380.80 is: 122,071.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,629.60 : 129,944.40 = 81,380.80 : x
  2. Step 2: Convert to fraction form
    86,629.60/129,944.40 = 81,380.80/x
  3. Step 3: Cross multiply
    86,629.60x = 129,944.40 × 81,380.80
  4. Step 4: Simplify right side
    86,629.60x = 10,574,979,227.52
  5. Step 5: Solve for x
    x = 10,574,979,227.52/86,629.60
  6. Step 6: Final answer
    x = 122,071.20

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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.