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Finding the Fourth Proportional to 388.15, 534.56 and 353.55

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Solution

The fourth proportional to 388.15, 534.56 and 353.55 is: 486.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.15 : 534.56 = 353.55 : x
  2. Step 2: Convert to fraction form
    388.15/534.56 = 353.55/x
  3. Step 3: Cross multiply
    388.15x = 534.56 × 353.55
  4. Step 4: Simplify right side
    388.15x = 188,993.69
  5. Step 5: Solve for x
    x = 188,993.69/388.15
  6. Step 6: Final answer
    x = 486.91

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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.