Home / 80,298.90-120,439.03-21,139.18

Finding the Fourth Proportional to 80,298.90, 120,439.03 and 21,139.18

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Solution

The fourth proportional to 80,298.90, 120,439.03 and 21,139.18 is: 31,706.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,298.90 : 120,439.03 = 21,139.18 : x
  2. Step 2: Convert to fraction form
    80,298.90/120,439.03 = 21,139.18/x
  3. Step 3: Cross multiply
    80,298.90x = 120,439.03 × 21,139.18
  4. Step 4: Simplify right side
    80,298.90x = 2,545,982,635.29
  5. Step 5: Solve for x
    x = 2,545,982,635.29/80,298.90
  6. Step 6: Final answer
    x = 31,706.32

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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.