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Finding the Fourth Proportional to 392.93, 542.21 and 215.88

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Solution

The fourth proportional to 392.93, 542.21 and 215.88 is: 297.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.93 : 542.21 = 215.88 : x
  2. Step 2: Convert to fraction form
    392.93/542.21 = 215.88/x
  3. Step 3: Cross multiply
    392.93x = 542.21 × 215.88
  4. Step 4: Simplify right side
    392.93x = 117,051.22
  5. Step 5: Solve for x
    x = 117,051.22/392.93
  6. Step 6: Final answer
    x = 297.90

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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.