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Finding the Fourth Proportional to 257.52, 384.10 and 238.40

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Solution

The fourth proportional to 257.52, 384.10 and 238.40 is: 355.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.52 : 384.10 = 238.40 : x
  2. Step 2: Convert to fraction form
    257.52/384.10 = 238.40/x
  3. Step 3: Cross multiply
    257.52x = 384.10 × 238.40
  4. Step 4: Simplify right side
    257.52x = 91,569.44
  5. Step 5: Solve for x
    x = 91,569.44/257.52
  6. Step 6: Final answer
    x = 355.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.