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Finding the Fourth Proportional to 70,581.78, 105,620.05 and 61,126.85

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Solution

The fourth proportional to 70,581.78, 105,620.05 and 61,126.85 is: 91,471.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,581.78 : 105,620.05 = 61,126.85 : x
  2. Step 2: Convert to fraction form
    70,581.78/105,620.05 = 61,126.85/x
  3. Step 3: Cross multiply
    70,581.78x = 105,620.05 × 61,126.85
  4. Step 4: Simplify right side
    70,581.78x = 6,456,221,293.80
  5. Step 5: Solve for x
    x = 6,456,221,293.80/70,581.78
  6. Step 6: Final answer
    x = 91,471.50

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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.