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Finding the Fourth Proportional to 308.66, 425.10 and 287.36

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Solution

The fourth proportional to 308.66, 425.10 and 287.36 is: 395.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.66 : 425.10 = 287.36 : x
  2. Step 2: Convert to fraction form
    308.66/425.10 = 287.36/x
  3. Step 3: Cross multiply
    308.66x = 425.10 × 287.36
  4. Step 4: Simplify right side
    308.66x = 122,156.74
  5. Step 5: Solve for x
    x = 122,156.74/308.66
  6. Step 6: Final answer
    x = 395.76

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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.