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Finding the Fourth Proportional to 81,470.40, 122,108.40 and 73,111.20

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Solution

The fourth proportional to 81,470.40, 122,108.40 and 73,111.20 is: 109,579.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,470.40 : 122,108.40 = 73,111.20 : x
  2. Step 2: Convert to fraction form
    81,470.40/122,108.40 = 73,111.20/x
  3. Step 3: Cross multiply
    81,470.40x = 122,108.40 × 73,111.20
  4. Step 4: Simplify right side
    81,470.40x = 8,927,491,654.08
  5. Step 5: Solve for x
    x = 8,927,491,654.08/81,470.40
  6. Step 6: Final answer
    x = 109,579.57

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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.