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Finding the Fourth Proportional to 81,251.40, 121,617.90 and 63,625.80

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Solution

The fourth proportional to 81,251.40, 121,617.90 and 63,625.80 is: 95,235.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,251.40 : 121,617.90 = 63,625.80 : x
  2. Step 2: Convert to fraction form
    81,251.40/121,617.90 = 63,625.80/x
  3. Step 3: Cross multiply
    81,251.40x = 121,617.90 × 63,625.80
  4. Step 4: Simplify right side
    81,251.40x = 7,738,036,181.82
  5. Step 5: Solve for x
    x = 7,738,036,181.82/81,251.40
  6. Step 6: Final answer
    x = 95,235.73

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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.