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Finding the Fourth Proportional to 86,721.80, 130,082.70 and 76,872.20

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Solution

The fourth proportional to 86,721.80, 130,082.70 and 76,872.20 is: 115,308.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,721.80 : 130,082.70 = 76,872.20 : x
  2. Step 2: Convert to fraction form
    86,721.80/130,082.70 = 76,872.20/x
  3. Step 3: Cross multiply
    86,721.80x = 130,082.70 × 76,872.20
  4. Step 4: Simplify right side
    86,721.80x = 9,999,743,330.94
  5. Step 5: Solve for x
    x = 9,999,743,330.94/86,721.80
  6. Step 6: Final answer
    x = 115,308.30

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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.