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Finding the Fourth Proportional to 392.72, 541.95 and 218.06

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Solution

The fourth proportional to 392.72, 541.95 and 218.06 is: 300.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.72 : 541.95 = 218.06 : x
  2. Step 2: Convert to fraction form
    392.72/541.95 = 218.06/x
  3. Step 3: Cross multiply
    392.72x = 541.95 × 218.06
  4. Step 4: Simplify right side
    392.72x = 118,179.79
  5. Step 5: Solve for x
    x = 118,179.79/392.72
  6. Step 6: Final answer
    x = 300.93

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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.