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Finding the Fourth Proportional to 86,485.20, 129,727.80 and 82,402.80

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Solution

The fourth proportional to 86,485.20, 129,727.80 and 82,402.80 is: 123,604.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,485.20 : 129,727.80 = 82,402.80 : x
  2. Step 2: Convert to fraction form
    86,485.20/129,727.80 = 82,402.80/x
  3. Step 3: Cross multiply
    86,485.20x = 129,727.80 × 82,402.80
  4. Step 4: Simplify right side
    86,485.20x = 10,689,933,957.84
  5. Step 5: Solve for x
    x = 10,689,933,957.84/86,485.20
  6. Step 6: Final answer
    x = 123,604.20

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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.