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Finding the Fourth Proportional to 81,096.72, 121,649.76 and 28,509.84

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Solution

The fourth proportional to 81,096.72, 121,649.76 and 28,509.84 is: 42,766.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,096.72 : 121,649.76 = 28,509.84 : x
  2. Step 2: Convert to fraction form
    81,096.72/121,649.76 = 28,509.84/x
  3. Step 3: Cross multiply
    81,096.72x = 121,649.76 × 28,509.84
  4. Step 4: Simplify right side
    81,096.72x = 3,468,215,193.64
  5. Step 5: Solve for x
    x = 3,468,215,193.64/81,096.72
  6. Step 6: Final answer
    x = 42,766.41

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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.