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Finding the Fourth Proportional to 71,238.74, 98,305.38 and 39,405.74

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Solution

The fourth proportional to 71,238.74, 98,305.38 and 39,405.74 is: 54,377.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,238.74 : 98,305.38 = 39,405.74 : x
  2. Step 2: Convert to fraction form
    71,238.74/98,305.38 = 39,405.74/x
  3. Step 3: Cross multiply
    71,238.74x = 98,305.38 × 39,405.74
  4. Step 4: Simplify right side
    71,238.74x = 3,873,795,753.35
  5. Step 5: Solve for x
    x = 3,873,795,753.35/71,238.74
  6. Step 6: Final answer
    x = 54,377.66

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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.