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Finding the Fourth Proportional to 80,646.54, 120,989.66 and 28,056.48

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Solution

The fourth proportional to 80,646.54, 120,989.66 and 28,056.48 is: 42,091.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,646.54 : 120,989.66 = 28,056.48 : x
  2. Step 2: Convert to fraction form
    80,646.54/120,989.66 = 28,056.48/x
  3. Step 3: Cross multiply
    80,646.54x = 120,989.66 × 28,056.48
  4. Step 4: Simplify right side
    80,646.54x = 3,394,543,835.71
  5. Step 5: Solve for x
    x = 3,394,543,835.71/80,646.54
  6. Step 6: Final answer
    x = 42,091.62

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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.