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Finding the Fourth Proportional to 86,644.80, 129,772.80 and 84,700.80

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Solution

The fourth proportional to 86,644.80, 129,772.80 and 84,700.80 is: 126,861.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,644.80 : 129,772.80 = 84,700.80 : x
  2. Step 2: Convert to fraction form
    86,644.80/129,772.80 = 84,700.80/x
  3. Step 3: Cross multiply
    86,644.80x = 129,772.80 × 84,700.80
  4. Step 4: Simplify right side
    86,644.80x = 10,991,859,978.24
  5. Step 5: Solve for x
    x = 10,991,859,978.24/86,644.80
  6. Step 6: Final answer
    x = 126,861.16

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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.