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Finding the Fourth Proportional to 392.99, 542.31 and 215.94

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Solution

The fourth proportional to 392.99, 542.31 and 215.94 is: 297.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.99 : 542.31 = 215.94 : x
  2. Step 2: Convert to fraction form
    392.99/542.31 = 215.94/x
  3. Step 3: Cross multiply
    392.99x = 542.31 × 215.94
  4. Step 4: Simplify right side
    392.99x = 117,106.42
  5. Step 5: Solve for x
    x = 117,106.42/392.99
  6. Step 6: Final answer
    x = 297.99

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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.