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Finding the Fourth Proportional to 81,249.76, 121,873.29 and 28,659.70

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Solution

The fourth proportional to 81,249.76, 121,873.29 and 28,659.70 is: 42,989.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,249.76 : 121,873.29 = 28,659.70 : x
  2. Step 2: Convert to fraction form
    81,249.76/121,873.29 = 28,659.70/x
  3. Step 3: Cross multiply
    81,249.76x = 121,873.29 × 28,659.70
  4. Step 4: Simplify right side
    81,249.76x = 3,492,851,929.41
  5. Step 5: Solve for x
    x = 3,492,851,929.41/81,249.76
  6. Step 6: Final answer
    x = 42,989.07

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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.