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Finding the Fourth Proportional to 85,859.80, 129,135.30 and 76,874.20

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Solution

The fourth proportional to 85,859.80, 129,135.30 and 76,874.20 is: 115,620.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,859.80 : 129,135.30 = 76,874.20 : x
  2. Step 2: Convert to fraction form
    85,859.80/129,135.30 = 76,874.20/x
  3. Step 3: Cross multiply
    85,859.80x = 129,135.30 × 76,874.20
  4. Step 4: Simplify right side
    85,859.80x = 9,927,172,879.26
  5. Step 5: Solve for x
    x = 9,927,172,879.26/85,859.80
  6. Step 6: Final answer
    x = 115,620.73

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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.