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Finding the Fourth Proportional to 81,047.20, 121,497.90 and 51,449.80

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Solution

The fourth proportional to 81,047.20, 121,497.90 and 51,449.80 is: 77,128.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,047.20 : 121,497.90 = 51,449.80 : x
  2. Step 2: Convert to fraction form
    81,047.20/121,497.90 = 51,449.80/x
  3. Step 3: Cross multiply
    81,047.20x = 121,497.90 × 51,449.80
  4. Step 4: Simplify right side
    81,047.20x = 6,251,042,655.42
  5. Step 5: Solve for x
    x = 6,251,042,655.42/81,047.20
  6. Step 6: Final answer
    x = 77,128.42

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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.