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Finding the Fourth Proportional to 85,858.80, 129,133.80 and 76,873.20

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Solution

The fourth proportional to 85,858.80, 129,133.80 and 76,873.20 is: 115,619.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,858.80 : 129,133.80 = 76,873.20 : x
  2. Step 2: Convert to fraction form
    85,858.80/129,133.80 = 76,873.20/x
  3. Step 3: Cross multiply
    85,858.80x = 129,133.80 × 76,873.20
  4. Step 4: Simplify right side
    85,858.80x = 9,926,928,434.16
  5. Step 5: Solve for x
    x = 9,926,928,434.16/85,858.80
  6. Step 6: Final answer
    x = 115,619.23

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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.