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Finding the Fourth Proportional to 78,479.92, 117,720.33 and 19,315.19

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Solution

The fourth proportional to 78,479.92, 117,720.33 and 19,315.19 is: 28,972.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,479.92 : 117,720.33 = 19,315.19 : x
  2. Step 2: Convert to fraction form
    78,479.92/117,720.33 = 19,315.19/x
  3. Step 3: Cross multiply
    78,479.92x = 117,720.33 × 19,315.19
  4. Step 4: Simplify right side
    78,479.92x = 2,273,790,429.88
  5. Step 5: Solve for x
    x = 2,273,790,429.88/78,479.92
  6. Step 6: Final answer
    x = 28,972.90

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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.