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Finding the Fourth Proportional to 81,210.76, 121,822.62 and 25,806.76

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Solution

The fourth proportional to 81,210.76, 121,822.62 and 25,806.76 is: 38,712.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,210.76 : 121,822.62 = 25,806.76 : x
  2. Step 2: Convert to fraction form
    81,210.76/121,822.62 = 25,806.76/x
  3. Step 3: Cross multiply
    81,210.76x = 121,822.62 × 25,806.76
  4. Step 4: Simplify right side
    81,210.76x = 3,143,847,116.91
  5. Step 5: Solve for x
    x = 3,143,847,116.91/81,210.76
  6. Step 6: Final answer
    x = 38,712.20

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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.