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Finding the Fourth Proportional to 388.48, 535.80 and 257.44

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Solution

The fourth proportional to 388.48, 535.80 and 257.44 is: 355.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.48 : 535.80 = 257.44 : x
  2. Step 2: Convert to fraction form
    388.48/535.80 = 257.44/x
  3. Step 3: Cross multiply
    388.48x = 535.80 × 257.44
  4. Step 4: Simplify right side
    388.48x = 137,936.35
  5. Step 5: Solve for x
    x = 137,936.35/388.48
  6. Step 6: Final answer
    x = 355.07

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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.