Home / 81,030.20-121,286.10-74,809.40

Finding the Fourth Proportional to 81,030.20, 121,286.10 and 74,809.40

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Solution

The fourth proportional to 81,030.20, 121,286.10 and 74,809.40 is: 111,974.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,030.20 : 121,286.10 = 74,809.40 : x
  2. Step 2: Convert to fraction form
    81,030.20/121,286.10 = 74,809.40/x
  3. Step 3: Cross multiply
    81,030.20x = 121,286.10 × 74,809.40
  4. Step 4: Simplify right side
    81,030.20x = 9,073,340,369.34
  5. Step 5: Solve for x
    x = 9,073,340,369.34/81,030.20
  6. Step 6: Final answer
    x = 111,974.80

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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.