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Finding the Fourth Proportional to 388.68, 535.90 and 257.48

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Solution

The fourth proportional to 388.68, 535.90 and 257.48 is: 355.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.68 : 535.90 = 257.48 : x
  2. Step 2: Convert to fraction form
    388.68/535.90 = 257.48/x
  3. Step 3: Cross multiply
    388.68x = 535.90 × 257.48
  4. Step 4: Simplify right side
    388.68x = 137,983.53
  5. Step 5: Solve for x
    x = 137,983.53/388.68
  6. Step 6: Final answer
    x = 355.01

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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.