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Finding the Fourth Proportional to 86,659.20, 129,879.45 and 42,190.20

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Solution

The fourth proportional to 86,659.20, 129,879.45 and 42,190.20 is: 63,232.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,659.20 : 129,879.45 = 42,190.20 : x
  2. Step 2: Convert to fraction form
    86,659.20/129,879.45 = 42,190.20/x
  3. Step 3: Cross multiply
    86,659.20x = 129,879.45 × 42,190.20
  4. Step 4: Simplify right side
    86,659.20x = 5,479,639,971.39
  5. Step 5: Solve for x
    x = 5,479,639,971.39/86,659.20
  6. Step 6: Final answer
    x = 63,232.06

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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.