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Finding the Fourth Proportional to 79,422.40, 118,939.20 and 37,820.80

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Solution

The fourth proportional to 79,422.40, 118,939.20 and 37,820.80 is: 56,638.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,422.40 : 118,939.20 = 37,820.80 : x
  2. Step 2: Convert to fraction form
    79,422.40/118,939.20 = 37,820.80/x
  3. Step 3: Cross multiply
    79,422.40x = 118,939.20 × 37,820.80
  4. Step 4: Simplify right side
    79,422.40x = 4,498,375,695.36
  5. Step 5: Solve for x
    x = 4,498,375,695.36/79,422.40
  6. Step 6: Final answer
    x = 56,638.63

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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.