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Finding the Fourth Proportional to 82,890.80, 124,190.40 and 68,019.20

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Solution

The fourth proportional to 82,890.80, 124,190.40 and 68,019.20 is: 101,909.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,890.80 : 124,190.40 = 68,019.20 : x
  2. Step 2: Convert to fraction form
    82,890.80/124,190.40 = 68,019.20/x
  3. Step 3: Cross multiply
    82,890.80x = 124,190.40 × 68,019.20
  4. Step 4: Simplify right side
    82,890.80x = 8,447,331,655.68
  5. Step 5: Solve for x
    x = 8,447,331,655.68/82,890.80
  6. Step 6: Final answer
    x = 101,909.16

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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.