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Finding the Fourth Proportional to 392.55, 541.72 and 215.52

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Solution

The fourth proportional to 392.55, 541.72 and 215.52 is: 297.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.55 : 541.72 = 215.52 : x
  2. Step 2: Convert to fraction form
    392.55/541.72 = 215.52/x
  3. Step 3: Cross multiply
    392.55x = 541.72 × 215.52
  4. Step 4: Simplify right side
    392.55x = 116,748.79
  5. Step 5: Solve for x
    x = 116,748.79/392.55
  6. Step 6: Final answer
    x = 297.42

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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.