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Finding the Fourth Proportional to 128,719.20, 192,925.20 and 53,839.20

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Solution

The fourth proportional to 128,719.20, 192,925.20 and 53,839.20 is: 80,694.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,719.20 : 192,925.20 = 53,839.20 : x
  2. Step 2: Convert to fraction form
    128,719.20/192,925.20 = 53,839.20/x
  3. Step 3: Cross multiply
    128,719.20x = 192,925.20 × 53,839.20
  4. Step 4: Simplify right side
    128,719.20x = 10,386,938,427.84
  5. Step 5: Solve for x
    x = 10,386,938,427.84/128,719.20
  6. Step 6: Final answer
    x = 80,694.55

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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.