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Finding the Fourth Proportional to 85,864.80, 129,142.80 and 76,879.20

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Solution

The fourth proportional to 85,864.80, 129,142.80 and 76,879.20 is: 115,628.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,864.80 : 129,142.80 = 76,879.20 : x
  2. Step 2: Convert to fraction form
    85,864.80/129,142.80 = 76,879.20/x
  3. Step 3: Cross multiply
    85,864.80x = 129,142.80 × 76,879.20
  4. Step 4: Simplify right side
    85,864.80x = 9,928,395,149.76
  5. Step 5: Solve for x
    x = 9,928,395,149.76/85,864.80
  6. Step 6: Final answer
    x = 115,628.23

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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.