Home / 80,720.64-121,084.20-28,135.44

Finding the Fourth Proportional to 80,720.64, 121,084.20 and 28,135.44

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Solution

The fourth proportional to 80,720.64, 121,084.20 and 28,135.44 is: 42,204.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,720.64 : 121,084.20 = 28,135.44 : x
  2. Step 2: Convert to fraction form
    80,720.64/121,084.20 = 28,135.44/x
  3. Step 3: Cross multiply
    80,720.64x = 121,084.20 × 28,135.44
  4. Step 4: Simplify right side
    80,720.64x = 3,406,757,244.05
  5. Step 5: Solve for x
    x = 3,406,757,244.05/80,720.64
  6. Step 6: Final answer
    x = 42,204.29

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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.