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Finding the Fourth Proportional to 83,986.80, 125,807.40 and 57,721.20

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Solution

The fourth proportional to 83,986.80, 125,807.40 and 57,721.20 is: 86,463.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,986.80 : 125,807.40 = 57,721.20 : x
  2. Step 2: Convert to fraction form
    83,986.80/125,807.40 = 57,721.20/x
  3. Step 3: Cross multiply
    83,986.80x = 125,807.40 × 57,721.20
  4. Step 4: Simplify right side
    83,986.80x = 7,261,754,096.88
  5. Step 5: Solve for x
    x = 7,261,754,096.88/83,986.80
  6. Step 6: Final answer
    x = 86,463.04

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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.