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Finding the Fourth Proportional to 86,641.80, 129,962.70 and 76,800.30

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Solution

The fourth proportional to 86,641.80, 129,962.70 and 76,800.30 is: 115,200.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,641.80 : 129,962.70 = 76,800.30 : x
  2. Step 2: Convert to fraction form
    86,641.80/129,962.70 = 76,800.30/x
  3. Step 3: Cross multiply
    86,641.80x = 129,962.70 × 76,800.30
  4. Step 4: Simplify right side
    86,641.80x = 9,981,174,348.81
  5. Step 5: Solve for x
    x = 9,981,174,348.81/86,641.80
  6. Step 6: Final answer
    x = 115,200.45

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Similar ratio
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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.