Home / 86,519.70-129,670.20-77,115.60

Finding the Fourth Proportional to 86,519.70, 129,670.20 and 77,115.60

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Solution

The fourth proportional to 86,519.70, 129,670.20 and 77,115.60 is: 115,575.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,519.70 : 129,670.20 = 77,115.60 : x
  2. Step 2: Convert to fraction form
    86,519.70/129,670.20 = 77,115.60/x
  3. Step 3: Cross multiply
    86,519.70x = 129,670.20 × 77,115.60
  4. Step 4: Simplify right side
    86,519.70x = 9,999,595,275.12
  5. Step 5: Solve for x
    x = 9,999,595,275.12/86,519.70
  6. Step 6: Final answer
    x = 115,575.94

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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.