Home / 81,116.10-121,382.55-74,117.70

Finding the Fourth Proportional to 81,116.10, 121,382.55 and 74,117.70

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Solution

The fourth proportional to 81,116.10, 121,382.55 and 74,117.70 is: 110,910.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,116.10 : 121,382.55 = 74,117.70 : x
  2. Step 2: Convert to fraction form
    81,116.10/121,382.55 = 74,117.70/x
  3. Step 3: Cross multiply
    81,116.10x = 121,382.55 × 74,117.70
  4. Step 4: Simplify right side
    81,116.10x = 8,996,595,426.14
  5. Step 5: Solve for x
    x = 8,996,595,426.14/81,116.10
  6. Step 6: Final answer
    x = 110,910.11

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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.