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Finding the Fourth Proportional to 125,321.21, 172,916.17 and 79,394.21

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Solution

The fourth proportional to 125,321.21, 172,916.17 and 79,394.21 is: 109,546.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,321.21 : 172,916.17 = 79,394.21 : x
  2. Step 2: Convert to fraction form
    125,321.21/172,916.17 = 79,394.21/x
  3. Step 3: Cross multiply
    125,321.21x = 172,916.17 × 79,394.21
  4. Step 4: Simplify right side
    125,321.21x = 13,728,542,298.75
  5. Step 5: Solve for x
    x = 13,728,542,298.75/125,321.21
  6. Step 6: Final answer
    x = 109,546.84

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1.5x scale

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.