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Finding the Fourth Proportional to 392.54, 542.40 and 282.38

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Solution

The fourth proportional to 392.54, 542.40 and 282.38 is: 390.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.54 : 542.40 = 282.38 : x
  2. Step 2: Convert to fraction form
    392.54/542.40 = 282.38/x
  3. Step 3: Cross multiply
    392.54x = 542.40 × 282.38
  4. Step 4: Simplify right side
    392.54x = 153,162.91
  5. Step 5: Solve for x
    x = 153,162.91/392.54
  6. Step 6: Final answer
    x = 390.18

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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.