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Finding the Fourth Proportional to 136,628.80, 204,981.60 and 57,780.80

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Solution

The fourth proportional to 136,628.80, 204,981.60 and 57,780.80 is: 86,687.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,628.80 : 204,981.60 = 57,780.80 : x
  2. Step 2: Convert to fraction form
    136,628.80/204,981.60 = 57,780.80/x
  3. Step 3: Cross multiply
    136,628.80x = 204,981.60 × 57,780.80
  4. Step 4: Simplify right side
    136,628.80x = 11,844,000,833.28
  5. Step 5: Solve for x
    x = 11,844,000,833.28/136,628.80
  6. Step 6: Final answer
    x = 86,687.44

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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.