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Finding the Fourth Proportional to 138,480.09, 207,720.12 and 79,274.04

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Solution

The fourth proportional to 138,480.09, 207,720.12 and 79,274.04 is: 118,911.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,480.09 : 207,720.12 = 79,274.04 : x
  2. Step 2: Convert to fraction form
    138,480.09/207,720.12 = 79,274.04/x
  3. Step 3: Cross multiply
    138,480.09x = 207,720.12 × 79,274.04
  4. Step 4: Simplify right side
    138,480.09x = 16,466,813,101.68
  5. Step 5: Solve for x
    x = 16,466,813,101.68/138,480.09
  6. Step 6: Final answer
    x = 118,911.05

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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.