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Finding the Fourth Proportional to 221,805.60, 332,708.40 and 81,618.90

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Solution

The fourth proportional to 221,805.60, 332,708.40 and 81,618.90 is: 122,428.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,805.60 : 332,708.40 = 81,618.90 : x
  2. Step 2: Convert to fraction form
    221,805.60/332,708.40 = 81,618.90/x
  3. Step 3: Cross multiply
    221,805.60x = 332,708.40 × 81,618.90
  4. Step 4: Simplify right side
    221,805.60x = 27,155,293,628.76
  5. Step 5: Solve for x
    x = 27,155,293,628.76/221,805.60
  6. Step 6: Final answer
    x = 122,428.35

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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.