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Finding the Fourth Proportional to 86,525.70, 129,679.20 and 77,121.60

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Solution

The fourth proportional to 86,525.70, 129,679.20 and 77,121.60 is: 115,584.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,525.70 : 129,679.20 = 77,121.60 : x
  2. Step 2: Convert to fraction form
    86,525.70/129,679.20 = 77,121.60/x
  3. Step 3: Cross multiply
    86,525.70x = 129,679.20 × 77,121.60
  4. Step 4: Simplify right side
    86,525.70x = 10,001,067,390.72
  5. Step 5: Solve for x
    x = 10,001,067,390.72/86,525.70
  6. Step 6: Final answer
    x = 115,584.93

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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.