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Finding the Fourth Proportional to 100,786.72, 139,071 and 60,491.92

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Solution

The fourth proportional to 100,786.72, 139,071 and 60,491.92 is: 83,470.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,786.72 : 139,071 = 60,491.92 : x
  2. Step 2: Convert to fraction form
    100,786.72/139,071 = 60,491.92/x
  3. Step 3: Cross multiply
    100,786.72x = 139,071 × 60,491.92
  4. Step 4: Simplify right side
    100,786.72x = 8,412,671,806.32
  5. Step 5: Solve for x
    x = 8,412,671,806.32/100,786.72
  6. Step 6: Final answer
    x = 83,470.04

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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.