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Finding the Fourth Proportional to 79,982.20, 119,973.30 and 78,815.80

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Solution

The fourth proportional to 79,982.20, 119,973.30 and 78,815.80 is: 118,223.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,982.20 : 119,973.30 = 78,815.80 : x
  2. Step 2: Convert to fraction form
    79,982.20/119,973.30 = 78,815.80/x
  3. Step 3: Cross multiply
    79,982.20x = 119,973.30 × 78,815.80
  4. Step 4: Simplify right side
    79,982.20x = 9,455,791,618.14
  5. Step 5: Solve for x
    x = 9,455,791,618.14/79,982.20
  6. Step 6: Final answer
    x = 118,223.70

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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.