Home / 81,021.66-121,357.53-79,038.78

Finding the Fourth Proportional to 81,021.66, 121,357.53 and 79,038.78

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Solution

The fourth proportional to 81,021.66, 121,357.53 and 79,038.78 is: 118,387.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,021.66 : 121,357.53 = 79,038.78 : x
  2. Step 2: Convert to fraction form
    81,021.66/121,357.53 = 79,038.78/x
  3. Step 3: Cross multiply
    81,021.66x = 121,357.53 × 79,038.78
  4. Step 4: Simplify right side
    81,021.66x = 9,591,951,115.01
  5. Step 5: Solve for x
    x = 9,591,951,115.01/81,021.66
  6. Step 6: Final answer
    x = 118,387.49

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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.