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Finding the Fourth Proportional to 45,081.32, 67,639.26 and 18,779

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Solution

The fourth proportional to 45,081.32, 67,639.26 and 18,779 is: 28,175.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,081.32 : 67,639.26 = 18,779 : x
  2. Step 2: Convert to fraction form
    45,081.32/67,639.26 = 18,779/x
  3. Step 3: Cross multiply
    45,081.32x = 67,639.26 × 18,779
  4. Step 4: Simplify right side
    45,081.32x = 1,270,197,663.54
  5. Step 5: Solve for x
    x = 1,270,197,663.54/45,081.32
  6. Step 6: Final answer
    x = 28,175.70

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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.