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Finding the Fourth Proportional to 104.20, 144.76 and 103.20

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Solution

The fourth proportional to 104.20, 144.76 and 103.20 is: 143.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.20 : 144.76 = 103.20 : x
  2. Step 2: Convert to fraction form
    104.20/144.76 = 103.20/x
  3. Step 3: Cross multiply
    104.20x = 144.76 × 103.20
  4. Step 4: Simplify right side
    104.20x = 14,939.23
  5. Step 5: Solve for x
    x = 14,939.23/104.20
  6. Step 6: Final answer
    x = 143.37

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.