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Finding the Fourth Proportional to 308.12, 424.80 and 284.66

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Solution

The fourth proportional to 308.12, 424.80 and 284.66 is: 392.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.12 : 424.80 = 284.66 : x
  2. Step 2: Convert to fraction form
    308.12/424.80 = 284.66/x
  3. Step 3: Cross multiply
    308.12x = 424.80 × 284.66
  4. Step 4: Simplify right side
    308.12x = 120,923.57
  5. Step 5: Solve for x
    x = 120,923.57/308.12
  6. Step 6: Final answer
    x = 392.46

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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.