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Finding the Fourth Proportional to 86,868.80, 130,581.60 and 80,705.60

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Solution

The fourth proportional to 86,868.80, 130,581.60 and 80,705.60 is: 121,317.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,868.80 : 130,581.60 = 80,705.60 : x
  2. Step 2: Convert to fraction form
    86,868.80/130,581.60 = 80,705.60/x
  3. Step 3: Cross multiply
    86,868.80x = 130,581.60 × 80,705.60
  4. Step 4: Simplify right side
    86,868.80x = 10,538,666,376.96
  5. Step 5: Solve for x
    x = 10,538,666,376.96/86,868.80
  6. Step 6: Final answer
    x = 121,317.05

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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.