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Finding the Fourth Proportional to 82,705.20, 124,057.80 and 76,873.20

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Solution

The fourth proportional to 82,705.20, 124,057.80 and 76,873.20 is: 115,309.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,705.20 : 124,057.80 = 76,873.20 : x
  2. Step 2: Convert to fraction form
    82,705.20/124,057.80 = 76,873.20/x
  3. Step 3: Cross multiply
    82,705.20x = 124,057.80 × 76,873.20
  4. Step 4: Simplify right side
    82,705.20x = 9,536,720,070.96
  5. Step 5: Solve for x
    x = 9,536,720,070.96/82,705.20
  6. Step 6: Final answer
    x = 115,309.80

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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.