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Finding the Fourth Proportional to 72,905.68, 100,609.83 and 39,371.68

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Solution

The fourth proportional to 72,905.68, 100,609.83 and 39,371.68 is: 54,332.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,905.68 : 100,609.83 = 39,371.68 : x
  2. Step 2: Convert to fraction form
    72,905.68/100,609.83 = 39,371.68/x
  3. Step 3: Cross multiply
    72,905.68x = 100,609.83 × 39,371.68
  4. Step 4: Simplify right side
    72,905.68x = 3,961,177,780.09
  5. Step 5: Solve for x
    x = 3,961,177,780.09/72,905.68
  6. Step 6: Final answer
    x = 54,332.91

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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.