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Finding the Fourth Proportional to 30,876, 42,609.12 and 18,311.52

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Solution

The fourth proportional to 30,876, 42,609.12 and 18,311.52 is: 25,270.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,876 : 42,609.12 = 18,311.52 : x
  2. Step 2: Convert to fraction form
    30,876/42,609.12 = 18,311.52/x
  3. Step 3: Cross multiply
    30,876x = 42,609.12 × 18,311.52
  4. Step 4: Simplify right side
    30,876x = 780,237,753.06
  5. Step 5: Solve for x
    x = 780,237,753.06/30,876
  6. Step 6: Final answer
    x = 25,270.04

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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.