Home / 86,619.60-129,670.20-81,493.20

Finding the Fourth Proportional to 86,619.60, 129,670.20 and 81,493.20

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Solution

The fourth proportional to 86,619.60, 129,670.20 and 81,493.20 is: 121,995.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,619.60 : 129,670.20 = 81,493.20 : x
  2. Step 2: Convert to fraction form
    86,619.60/129,670.20 = 81,493.20/x
  3. Step 3: Cross multiply
    86,619.60x = 129,670.20 × 81,493.20
  4. Step 4: Simplify right side
    86,619.60x = 10,567,239,542.64
  5. Step 5: Solve for x
    x = 10,567,239,542.64/86,619.60
  6. Step 6: Final answer
    x = 121,995.94

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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.