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Finding the Fourth Proportional to 84,279.40, 126,437.92 and 31,689.34

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Solution

The fourth proportional to 84,279.40, 126,437.92 and 31,689.34 is: 47,541.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,279.40 : 126,437.92 = 31,689.34 : x
  2. Step 2: Convert to fraction form
    84,279.40/126,437.92 = 31,689.34/x
  3. Step 3: Cross multiply
    84,279.40x = 126,437.92 × 31,689.34
  4. Step 4: Simplify right side
    84,279.40x = 4,006,734,235.77
  5. Step 5: Solve for x
    x = 4,006,734,235.77/84,279.40
  6. Step 6: Final answer
    x = 47,541.09

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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.