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Finding the Fourth Proportional to 308.91, 425.86 and 242.39

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Solution

The fourth proportional to 308.91, 425.86 and 242.39 is: 334.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.91 : 425.86 = 242.39 : x
  2. Step 2: Convert to fraction form
    308.91/425.86 = 242.39/x
  3. Step 3: Cross multiply
    308.91x = 425.86 × 242.39
  4. Step 4: Simplify right side
    308.91x = 103,224.66
  5. Step 5: Solve for x
    x = 103,224.66/308.91
  6. Step 6: Final answer
    x = 334.15

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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.