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Finding the Fourth Proportional to 86,572.80, 129,859.20 and 81,388.80

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Solution

The fourth proportional to 86,572.80, 129,859.20 and 81,388.80 is: 122,083.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,572.80 : 129,859.20 = 81,388.80 : x
  2. Step 2: Convert to fraction form
    86,572.80/129,859.20 = 81,388.80/x
  3. Step 3: Cross multiply
    86,572.80x = 129,859.20 × 81,388.80
  4. Step 4: Simplify right side
    86,572.80x = 10,569,084,456.96
  5. Step 5: Solve for x
    x = 10,569,084,456.96/86,572.80
  6. Step 6: Final answer
    x = 122,083.20

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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.