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Finding the Fourth Proportional to 83,871.30, 125,875.80 and 83,215.20

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Solution

The fourth proportional to 83,871.30, 125,875.80 and 83,215.20 is: 124,891.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,871.30 : 125,875.80 = 83,215.20 : x
  2. Step 2: Convert to fraction form
    83,871.30/125,875.80 = 83,215.20/x
  3. Step 3: Cross multiply
    83,871.30x = 125,875.80 × 83,215.20
  4. Step 4: Simplify right side
    83,871.30x = 10,474,779,872.16
  5. Step 5: Solve for x
    x = 10,474,779,872.16/83,871.30
  6. Step 6: Final answer
    x = 124,891.11

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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.