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Finding the Fourth Proportional to 139,480.92, 209,209.50 and 55,218.18

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Solution

The fourth proportional to 139,480.92, 209,209.50 and 55,218.18 is: 82,822.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,480.92 : 209,209.50 = 55,218.18 : x
  2. Step 2: Convert to fraction form
    139,480.92/209,209.50 = 55,218.18/x
  3. Step 3: Cross multiply
    139,480.92x = 209,209.50 × 55,218.18
  4. Step 4: Simplify right side
    139,480.92x = 11,552,167,828.71
  5. Step 5: Solve for x
    x = 11,552,167,828.71/139,480.92
  6. Step 6: Final answer
    x = 82,822.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.