Home / 80,720.04-121,080.78-28,129.44

Finding the Fourth Proportional to 80,720.04, 121,080.78 and 28,129.44

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Solution

The fourth proportional to 80,720.04, 121,080.78 and 28,129.44 is: 42,194.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,720.04 : 121,080.78 = 28,129.44 : x
  2. Step 2: Convert to fraction form
    80,720.04/121,080.78 = 28,129.44/x
  3. Step 3: Cross multiply
    80,720.04x = 121,080.78 × 28,129.44
  4. Step 4: Simplify right side
    80,720.04x = 3,405,934,536.16
  5. Step 5: Solve for x
    x = 3,405,934,536.16/80,720.04
  6. Step 6: Final answer
    x = 42,194.41

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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.