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Finding the Fourth Proportional to 243.24, 364.78 and 69.90

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Solution

The fourth proportional to 243.24, 364.78 and 69.90 is: 104.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.24 : 364.78 = 69.90 : x
  2. Step 2: Convert to fraction form
    243.24/364.78 = 69.90/x
  3. Step 3: Cross multiply
    243.24x = 364.78 × 69.90
  4. Step 4: Simplify right side
    243.24x = 25,498.12
  5. Step 5: Solve for x
    x = 25,498.12/243.24
  6. Step 6: Final answer
    x = 104.83

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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.