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Finding the Fourth Proportional to 388.70, 535.83 and 257.48

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Solution

The fourth proportional to 388.70, 535.83 and 257.48 is: 354.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.70 : 535.83 = 257.48 : x
  2. Step 2: Convert to fraction form
    388.70/535.83 = 257.48/x
  3. Step 3: Cross multiply
    388.70x = 535.83 × 257.48
  4. Step 4: Simplify right side
    388.70x = 137,965.51
  5. Step 5: Solve for x
    x = 137,965.51/388.70
  6. Step 6: Final answer
    x = 354.94

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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.