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Finding the Fourth Proportional to 308.16, 424.08 and 249.12

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Solution

The fourth proportional to 308.16, 424.08 and 249.12 is: 342.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.16 : 424.08 = 249.12 : x
  2. Step 2: Convert to fraction form
    308.16/424.08 = 249.12/x
  3. Step 3: Cross multiply
    308.16x = 424.08 × 249.12
  4. Step 4: Simplify right side
    308.16x = 105,646.81
  5. Step 5: Solve for x
    x = 105,646.81/308.16
  6. Step 6: Final answer
    x = 342.83

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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.