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Finding the Fourth Proportional to 81,304.35, 121,959.65 and 25,139.40

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Solution

The fourth proportional to 81,304.35, 121,959.65 and 25,139.40 is: 37,710.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,304.35 : 121,959.65 = 25,139.40 : x
  2. Step 2: Convert to fraction form
    81,304.35/121,959.65 = 25,139.40/x
  3. Step 3: Cross multiply
    81,304.35x = 121,959.65 × 25,139.40
  4. Step 4: Simplify right side
    81,304.35x = 3,065,992,425.21
  5. Step 5: Solve for x
    x = 3,065,992,425.21/81,304.35
  6. Step 6: Final answer
    x = 37,710.07

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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.