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Finding the Fourth Proportional to 80,754.40, 121,117.20 and 51,119.20

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Solution

The fourth proportional to 80,754.40, 121,117.20 and 51,119.20 is: 76,669.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,754.40 : 121,117.20 = 51,119.20 : x
  2. Step 2: Convert to fraction form
    80,754.40/121,117.20 = 51,119.20/x
  3. Step 3: Cross multiply
    80,754.40x = 121,117.20 × 51,119.20
  4. Step 4: Simplify right side
    80,754.40x = 6,191,414,370.24
  5. Step 5: Solve for x
    x = 6,191,414,370.24/80,754.40
  6. Step 6: Final answer
    x = 76,669.68

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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.