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Finding the Fourth Proportional to 388.27, 535.96 and 257.32

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Solution

The fourth proportional to 388.27, 535.96 and 257.32 is: 355.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.27 : 535.96 = 257.32 : x
  2. Step 2: Convert to fraction form
    388.27/535.96 = 257.32/x
  3. Step 3: Cross multiply
    388.27x = 535.96 × 257.32
  4. Step 4: Simplify right side
    388.27x = 137,911.94
  5. Step 5: Solve for x
    x = 137,911.94/388.27
  6. Step 6: Final answer
    x = 355.20

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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.