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Finding the Fourth Proportional to 86,015.20, 129,022.80 and 77,720.80

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Solution

The fourth proportional to 86,015.20, 129,022.80 and 77,720.80 is: 116,581.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,015.20 : 129,022.80 = 77,720.80 : x
  2. Step 2: Convert to fraction form
    86,015.20/129,022.80 = 77,720.80/x
  3. Step 3: Cross multiply
    86,015.20x = 129,022.80 × 77,720.80
  4. Step 4: Simplify right side
    86,015.20x = 10,027,755,234.24
  5. Step 5: Solve for x
    x = 10,027,755,234.24/86,015.20
  6. Step 6: Final answer
    x = 116,581.20

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1.5x scale

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.