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Finding the Fourth Proportional to 395.88, 542.76 and 388.98

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Solution

The fourth proportional to 395.88, 542.76 and 388.98 is: 533.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.88 : 542.76 = 388.98 : x
  2. Step 2: Convert to fraction form
    395.88/542.76 = 388.98/x
  3. Step 3: Cross multiply
    395.88x = 542.76 × 388.98
  4. Step 4: Simplify right side
    395.88x = 211,122.78
  5. Step 5: Solve for x
    x = 211,122.78/395.88
  6. Step 6: Final answer
    x = 533.30

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.