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Finding the Fourth Proportional to 243.65, 336.71 and 216.65

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Solution

The fourth proportional to 243.65, 336.71 and 216.65 is: 299.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.65 : 336.71 = 216.65 : x
  2. Step 2: Convert to fraction form
    243.65/336.71 = 216.65/x
  3. Step 3: Cross multiply
    243.65x = 336.71 × 216.65
  4. Step 4: Simplify right side
    243.65x = 72,948.22
  5. Step 5: Solve for x
    x = 72,948.22/243.65
  6. Step 6: Final answer
    x = 299.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.