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Finding the Fourth Proportional to 81,867.20, 122,800.80 and 61,131.20

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Solution

The fourth proportional to 81,867.20, 122,800.80 and 61,131.20 is: 91,696.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,867.20 : 122,800.80 = 61,131.20 : x
  2. Step 2: Convert to fraction form
    81,867.20/122,800.80 = 61,131.20/x
  3. Step 3: Cross multiply
    81,867.20x = 122,800.80 × 61,131.20
  4. Step 4: Simplify right side
    81,867.20x = 7,506,960,264.96
  5. Step 5: Solve for x
    x = 7,506,960,264.96/81,867.20
  6. Step 6: Final answer
    x = 91,696.80

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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.