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Finding the Fourth Proportional to 78,873.30, 118,309.95 and 72,422.10

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Solution

The fourth proportional to 78,873.30, 118,309.95 and 72,422.10 is: 108,633.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,873.30 : 118,309.95 = 72,422.10 : x
  2. Step 2: Convert to fraction form
    78,873.30/118,309.95 = 72,422.10/x
  3. Step 3: Cross multiply
    78,873.30x = 118,309.95 × 72,422.10
  4. Step 4: Simplify right side
    78,873.30x = 8,568,255,029.90
  5. Step 5: Solve for x
    x = 8,568,255,029.90/78,873.30
  6. Step 6: Final answer
    x = 108,633.15

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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.