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Finding the Fourth Proportional to 128,687.84, 193,026.72 and 53,788.64

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Solution

The fourth proportional to 128,687.84, 193,026.72 and 53,788.64 is: 80,680.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,687.84 : 193,026.72 = 53,788.64 : x
  2. Step 2: Convert to fraction form
    128,687.84/193,026.72 = 53,788.64/x
  3. Step 3: Cross multiply
    128,687.84x = 193,026.72 × 53,788.64
  4. Step 4: Simplify right side
    128,687.84x = 10,382,644,752.46
  5. Step 5: Solve for x
    x = 10,382,644,752.46/128,687.84
  6. Step 6: Final answer
    x = 80,680.85

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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.