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Finding the Fourth Proportional to 128,910.31, 193,370.71 and 61,407.65

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Solution

The fourth proportional to 128,910.31, 193,370.71 and 61,407.65 is: 92,113.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,910.31 : 193,370.71 = 61,407.65 : x
  2. Step 2: Convert to fraction form
    128,910.31/193,370.71 = 61,407.65/x
  3. Step 3: Cross multiply
    128,910.31x = 193,370.71 × 61,407.65
  4. Step 4: Simplify right side
    128,910.31x = 11,874,439,759.56
  5. Step 5: Solve for x
    x = 11,874,439,759.56/128,910.31
  6. Step 6: Final answer
    x = 92,113.97

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1.5x scale

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.