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Finding the Fourth Proportional to 128,956.80, 193,412.92 and 34,187.64

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Solution

The fourth proportional to 128,956.80, 193,412.92 and 34,187.64 is: 51,275.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,956.80 : 193,412.92 = 34,187.64 : x
  2. Step 2: Convert to fraction form
    128,956.80/193,412.92 = 34,187.64/x
  3. Step 3: Cross multiply
    128,956.80x = 193,412.92 × 34,187.64
  4. Step 4: Simplify right side
    128,956.80x = 6,612,331,280.31
  5. Step 5: Solve for x
    x = 6,612,331,280.31/128,956.80
  6. Step 6: Final answer
    x = 51,275.55

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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.