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Finding the Fourth Proportional to 72,908, 100,613.06 and 39,374

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Solution

The fourth proportional to 72,908, 100,613.06 and 39,374 is: 54,336.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,908 : 100,613.06 = 39,374 : x
  2. Step 2: Convert to fraction form
    72,908/100,613.06 = 39,374/x
  3. Step 3: Cross multiply
    72,908x = 100,613.06 × 39,374
  4. Step 4: Simplify right side
    72,908x = 3,961,538,624.44
  5. Step 5: Solve for x
    x = 3,961,538,624.44/72,908
  6. Step 6: Final answer
    x = 54,336.13

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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.