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Finding the Fourth Proportional to 139,618.92, 192,587.72 and 121,756.80

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Solution

The fourth proportional to 139,618.92, 192,587.72 and 121,756.80 is: 167,949.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,618.92 : 192,587.72 = 121,756.80 : x
  2. Step 2: Convert to fraction form
    139,618.92/192,587.72 = 121,756.80/x
  3. Step 3: Cross multiply
    139,618.92x = 192,587.72 × 121,756.80
  4. Step 4: Simplify right side
    139,618.92x = 23,448,863,897.71
  5. Step 5: Solve for x
    x = 23,448,863,897.71/139,618.92
  6. Step 6: Final answer
    x = 167,949.04

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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.