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Finding the Fourth Proportional to 86,528.80, 129,793.20 and 66,845.80

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Solution

The fourth proportional to 86,528.80, 129,793.20 and 66,845.80 is: 100,268.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,528.80 : 129,793.20 = 66,845.80 : x
  2. Step 2: Convert to fraction form
    86,528.80/129,793.20 = 66,845.80/x
  3. Step 3: Cross multiply
    86,528.80x = 129,793.20 × 66,845.80
  4. Step 4: Simplify right side
    86,528.80x = 8,676,130,288.56
  5. Step 5: Solve for x
    x = 8,676,130,288.56/86,528.80
  6. Step 6: Final answer
    x = 100,268.70

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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.