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Finding the Fourth Proportional to 542.80, 812.56 and 388

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Solution

The fourth proportional to 542.80, 812.56 and 388 is: 580.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.80 : 812.56 = 388 : x
  2. Step 2: Convert to fraction form
    542.80/812.56 = 388/x
  3. Step 3: Cross multiply
    542.80x = 812.56 × 388
  4. Step 4: Simplify right side
    542.80x = 315,273.28
  5. Step 5: Solve for x
    x = 315,273.28/542.80
  6. Step 6: Final answer
    x = 580.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.