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Finding the Fourth Proportional to 392.75, 542.19 and 253.02

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Solution

The fourth proportional to 392.75, 542.19 and 253.02 is: 349.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.75 : 542.19 = 253.02 : x
  2. Step 2: Convert to fraction form
    392.75/542.19 = 253.02/x
  3. Step 3: Cross multiply
    392.75x = 542.19 × 253.02
  4. Step 4: Simplify right side
    392.75x = 137,187.90
  5. Step 5: Solve for x
    x = 137,187.90/392.75
  6. Step 6: Final answer
    x = 349.30

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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.