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Finding the Fourth Proportional to 100,979.52, 139,351.02 and 55,657.50

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Solution

The fourth proportional to 100,979.52, 139,351.02 and 55,657.50 is: 76,806.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,979.52 : 139,351.02 = 55,657.50 : x
  2. Step 2: Convert to fraction form
    100,979.52/139,351.02 = 55,657.50/x
  3. Step 3: Cross multiply
    100,979.52x = 139,351.02 × 55,657.50
  4. Step 4: Simplify right side
    100,979.52x = 7,755,929,395.65
  5. Step 5: Solve for x
    x = 7,755,929,395.65/100,979.52
  6. Step 6: Final answer
    x = 76,806.95

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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.