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Finding the Fourth Proportional to 80,991.90, 121,504.05 and 28,438.29

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Solution

The fourth proportional to 80,991.90, 121,504.05 and 28,438.29 is: 42,663.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,991.90 : 121,504.05 = 28,438.29 : x
  2. Step 2: Convert to fraction form
    80,991.90/121,504.05 = 28,438.29/x
  3. Step 3: Cross multiply
    80,991.90x = 121,504.05 × 28,438.29
  4. Step 4: Simplify right side
    80,991.90x = 3,455,367,410.07
  5. Step 5: Solve for x
    x = 3,455,367,410.07/80,991.90
  6. Step 6: Final answer
    x = 42,663.12

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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.