Home / 81,195.40-121,720.20-53,128.90

Finding the Fourth Proportional to 81,195.40, 121,720.20 and 53,128.90

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Solution

The fourth proportional to 81,195.40, 121,720.20 and 53,128.90 is: 79,645.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,195.40 : 121,720.20 = 53,128.90 : x
  2. Step 2: Convert to fraction form
    81,195.40/121,720.20 = 53,128.90/x
  3. Step 3: Cross multiply
    81,195.40x = 121,720.20 × 53,128.90
  4. Step 4: Simplify right side
    81,195.40x = 6,466,860,333.78
  5. Step 5: Solve for x
    x = 6,466,860,333.78/81,195.40
  6. Step 6: Final answer
    x = 79,645.65

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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.