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Finding the Fourth Proportional to 392.73, 541.95 and 215.69

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Solution

The fourth proportional to 392.73, 541.95 and 215.69 is: 297.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.73 : 541.95 = 215.69 : x
  2. Step 2: Convert to fraction form
    392.73/541.95 = 215.69/x
  3. Step 3: Cross multiply
    392.73x = 541.95 × 215.69
  4. Step 4: Simplify right side
    392.73x = 116,890.49
  5. Step 5: Solve for x
    x = 116,890.49/392.73
  6. Step 6: Final answer
    x = 297.64

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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.