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Finding the Fourth Proportional to 78,021.20, 117,031.80 and 62,469.20

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Solution

The fourth proportional to 78,021.20, 117,031.80 and 62,469.20 is: 93,703.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,021.20 : 117,031.80 = 62,469.20 : x
  2. Step 2: Convert to fraction form
    78,021.20/117,031.80 = 62,469.20/x
  3. Step 3: Cross multiply
    78,021.20x = 117,031.80 × 62,469.20
  4. Step 4: Simplify right side
    78,021.20x = 7,310,882,920.56
  5. Step 5: Solve for x
    x = 7,310,882,920.56/78,021.20
  6. Step 6: Final answer
    x = 93,703.80

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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.