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Finding the Fourth Proportional to 81,253.39, 121,888.20 and 30,639.61

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Solution

The fourth proportional to 81,253.39, 121,888.20 and 30,639.61 is: 45,962.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,253.39 : 121,888.20 = 30,639.61 : x
  2. Step 2: Convert to fraction form
    81,253.39/121,888.20 = 30,639.61/x
  3. Step 3: Cross multiply
    81,253.39x = 121,888.20 × 30,639.61
  4. Step 4: Simplify right side
    81,253.39x = 3,734,606,911.60
  5. Step 5: Solve for x
    x = 3,734,606,911.60/81,253.39
  6. Step 6: Final answer
    x = 45,962.48

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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.