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Finding the Fourth Proportional to 91,198.69, 125,856.30 and 57,208.61

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Solution

The fourth proportional to 91,198.69, 125,856.30 and 57,208.61 is: 78,949.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,198.69 : 125,856.30 = 57,208.61 : x
  2. Step 2: Convert to fraction form
    91,198.69/125,856.30 = 57,208.61/x
  3. Step 3: Cross multiply
    91,198.69x = 125,856.30 × 57,208.61
  4. Step 4: Simplify right side
    91,198.69x = 7,200,063,353.46
  5. Step 5: Solve for x
    x = 7,200,063,353.46/91,198.69
  6. Step 6: Final answer
    x = 78,949.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.