Home / 81,021.29-121,356.97-79,038.41

Finding the Fourth Proportional to 81,021.29, 121,356.97 and 79,038.41

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Solution

The fourth proportional to 81,021.29, 121,356.97 and 79,038.41 is: 118,386.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,021.29 : 121,356.97 = 79,038.41 : x
  2. Step 2: Convert to fraction form
    81,021.29/121,356.97 = 79,038.41/x
  3. Step 3: Cross multiply
    81,021.29x = 121,356.97 × 79,038.41
  4. Step 4: Simplify right side
    81,021.29x = 9,591,861,146.84
  5. Step 5: Solve for x
    x = 9,591,861,146.84/81,021.29
  6. Step 6: Final answer
    x = 118,386.93

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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.