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Finding the Fourth Proportional to 243.68, 365.44 and 99.28

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Solution

The fourth proportional to 243.68, 365.44 and 99.28 is: 148.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.68 : 365.44 = 99.28 : x
  2. Step 2: Convert to fraction form
    243.68/365.44 = 99.28/x
  3. Step 3: Cross multiply
    243.68x = 365.44 × 99.28
  4. Step 4: Simplify right side
    243.68x = 36,280.88
  5. Step 5: Solve for x
    x = 36,280.88/243.68
  6. Step 6: Final answer
    x = 148.89

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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.