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Finding the Fourth Proportional to 115,408.80, 173,113.20 and 79,979.40

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Solution

The fourth proportional to 115,408.80, 173,113.20 and 79,979.40 is: 119,969.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,408.80 : 173,113.20 = 79,979.40 : x
  2. Step 2: Convert to fraction form
    115,408.80/173,113.20 = 79,979.40/x
  3. Step 3: Cross multiply
    115,408.80x = 173,113.20 × 79,979.40
  4. Step 4: Simplify right side
    115,408.80x = 13,845,489,868.08
  5. Step 5: Solve for x
    x = 13,845,489,868.08/115,408.80
  6. Step 6: Final answer
    x = 119,969.10

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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.