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Finding the Fourth Proportional to 243.28, 364.98 and 216.40

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Solution

The fourth proportional to 243.28, 364.98 and 216.40 is: 324.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.28 : 364.98 = 216.40 : x
  2. Step 2: Convert to fraction form
    243.28/364.98 = 216.40/x
  3. Step 3: Cross multiply
    243.28x = 364.98 × 216.40
  4. Step 4: Simplify right side
    243.28x = 78,981.67
  5. Step 5: Solve for x
    x = 78,981.67/243.28
  6. Step 6: Final answer
    x = 324.65

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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.