Home / 84,102.12-126,138.60-31,500.72

Finding the Fourth Proportional to 84,102.12, 126,138.60 and 31,500.72

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Solution

The fourth proportional to 84,102.12, 126,138.60 and 31,500.72 is: 47,245.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,102.12 : 126,138.60 = 31,500.72 : x
  2. Step 2: Convert to fraction form
    84,102.12/126,138.60 = 31,500.72/x
  3. Step 3: Cross multiply
    84,102.12x = 126,138.60 × 31,500.72
  4. Step 4: Simplify right side
    84,102.12x = 3,973,456,719.79
  5. Step 5: Solve for x
    x = 3,973,456,719.79/84,102.12
  6. Step 6: Final answer
    x = 47,245.62

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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.