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Finding the Fourth Proportional to 40,422.80, 60,634.20 and 12,720.80

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Solution

The fourth proportional to 40,422.80, 60,634.20 and 12,720.80 is: 19,081.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,422.80 : 60,634.20 = 12,720.80 : x
  2. Step 2: Convert to fraction form
    40,422.80/60,634.20 = 12,720.80/x
  3. Step 3: Cross multiply
    40,422.80x = 60,634.20 × 12,720.80
  4. Step 4: Simplify right side
    40,422.80x = 771,315,531.36
  5. Step 5: Solve for x
    x = 771,315,531.36/40,422.80
  6. Step 6: Final answer
    x = 19,081.20

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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.