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Finding the Fourth Proportional to 243.36, 365.12 and 113.40

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Solution

The fourth proportional to 243.36, 365.12 and 113.40 is: 170.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.36 : 365.12 = 113.40 : x
  2. Step 2: Convert to fraction form
    243.36/365.12 = 113.40/x
  3. Step 3: Cross multiply
    243.36x = 365.12 × 113.40
  4. Step 4: Simplify right side
    243.36x = 41,404.61
  5. Step 5: Solve for x
    x = 41,404.61/243.36
  6. Step 6: Final answer
    x = 170.14

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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.