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Finding the Fourth Proportional to 102,628.80, 153,799.20 and 81,604.80

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Solution

The fourth proportional to 102,628.80, 153,799.20 and 81,604.80 is: 122,292.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,628.80 : 153,799.20 = 81,604.80 : x
  2. Step 2: Convert to fraction form
    102,628.80/153,799.20 = 81,604.80/x
  3. Step 3: Cross multiply
    102,628.80x = 153,799.20 × 81,604.80
  4. Step 4: Simplify right side
    102,628.80x = 12,550,752,956.16
  5. Step 5: Solve for x
    x = 12,550,752,956.16/102,628.80
  6. Step 6: Final answer
    x = 122,292.70

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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.