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Finding the Fourth Proportional to 392.15, 541.15 and 217.49

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Solution

The fourth proportional to 392.15, 541.15 and 217.49 is: 300.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.15 : 541.15 = 217.49 : x
  2. Step 2: Convert to fraction form
    392.15/541.15 = 217.49/x
  3. Step 3: Cross multiply
    392.15x = 541.15 × 217.49
  4. Step 4: Simplify right side
    392.15x = 117,694.71
  5. Step 5: Solve for x
    x = 117,694.71/392.15
  6. Step 6: Final answer
    x = 300.13

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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.