Home / 80,386.90-120,512.31-30,439.47

Finding the Fourth Proportional to 80,386.90, 120,512.31 and 30,439.47

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Solution

The fourth proportional to 80,386.90, 120,512.31 and 30,439.47 is: 45,633.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,386.90 : 120,512.31 = 30,439.47 : x
  2. Step 2: Convert to fraction form
    80,386.90/120,512.31 = 30,439.47/x
  3. Step 3: Cross multiply
    80,386.90x = 120,512.31 × 30,439.47
  4. Step 4: Simplify right side
    80,386.90x = 3,668,330,844.88
  5. Step 5: Solve for x
    x = 3,668,330,844.88/80,386.90
  6. Step 6: Final answer
    x = 45,633.44

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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.