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Finding the Fourth Proportional to 85,105.80, 127,658.70 and 72,421.20

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Solution

The fourth proportional to 85,105.80, 127,658.70 and 72,421.20 is: 108,631.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,105.80 : 127,658.70 = 72,421.20 : x
  2. Step 2: Convert to fraction form
    85,105.80/127,658.70 = 72,421.20/x
  3. Step 3: Cross multiply
    85,105.80x = 127,658.70 × 72,421.20
  4. Step 4: Simplify right side
    85,105.80x = 9,245,196,244.44
  5. Step 5: Solve for x
    x = 9,245,196,244.44/85,105.80
  6. Step 6: Final answer
    x = 108,631.80

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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.