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Finding the Fourth Proportional to 81,951.20, 122,955.60 and 79,071.20

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Solution

The fourth proportional to 81,951.20, 122,955.60 and 79,071.20 is: 118,634.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,951.20 : 122,955.60 = 79,071.20 : x
  2. Step 2: Convert to fraction form
    81,951.20/122,955.60 = 79,071.20/x
  3. Step 3: Cross multiply
    81,951.20x = 122,955.60 × 79,071.20
  4. Step 4: Simplify right side
    81,951.20x = 9,722,246,838.72
  5. Step 5: Solve for x
    x = 9,722,246,838.72/81,951.20
  6. Step 6: Final answer
    x = 118,634.59

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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.