Home / 138,122.14-190,623.30-80,779

Finding the Fourth Proportional to 138,122.14, 190,623.30 and 80,779

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Solution

The fourth proportional to 138,122.14, 190,623.30 and 80,779 is: 111,483.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,122.14 : 190,623.30 = 80,779 : x
  2. Step 2: Convert to fraction form
    138,122.14/190,623.30 = 80,779/x
  3. Step 3: Cross multiply
    138,122.14x = 190,623.30 × 80,779
  4. Step 4: Simplify right side
    138,122.14x = 15,398,359,550.70
  5. Step 5: Solve for x
    x = 15,398,359,550.70/138,122.14
  6. Step 6: Final answer
    x = 111,483.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.