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Finding the Fourth Proportional to 125,915.16, 173,742.66 and 72,189.48

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Solution

The fourth proportional to 125,915.16, 173,742.66 and 72,189.48 is: 99,609.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,915.16 : 173,742.66 = 72,189.48 : x
  2. Step 2: Convert to fraction form
    125,915.16/173,742.66 = 72,189.48/x
  3. Step 3: Cross multiply
    125,915.16x = 173,742.66 × 72,189.48
  4. Step 4: Simplify right side
    125,915.16x = 12,542,392,279.22
  5. Step 5: Solve for x
    x = 12,542,392,279.22/125,915.16
  6. Step 6: Final answer
    x = 99,609.87

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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.