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Finding the Fourth Proportional to 243.96, 365.70 and 99.78

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Solution

The fourth proportional to 243.96, 365.70 and 99.78 is: 149.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.96 : 365.70 = 99.78 : x
  2. Step 2: Convert to fraction form
    243.96/365.70 = 99.78/x
  3. Step 3: Cross multiply
    243.96x = 365.70 × 99.78
  4. Step 4: Simplify right side
    243.96x = 36,489.55
  5. Step 5: Solve for x
    x = 36,489.55/243.96
  6. Step 6: Final answer
    x = 149.57

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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.