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Finding the Fourth Proportional to 392.29, 541.43 and 217.69

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Solution

The fourth proportional to 392.29, 541.43 and 217.69 is: 300.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.29 : 541.43 = 217.69 : x
  2. Step 2: Convert to fraction form
    392.29/541.43 = 217.69/x
  3. Step 3: Cross multiply
    392.29x = 541.43 × 217.69
  4. Step 4: Simplify right side
    392.29x = 117,862.81
  5. Step 5: Solve for x
    x = 117,862.81/392.29
  6. Step 6: Final answer
    x = 300.45

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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.