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Finding the Fourth Proportional to 256.52, 383.88 and 238.40

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Solution

The fourth proportional to 256.52, 383.88 and 238.40 is: 356.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.52 : 383.88 = 238.40 : x
  2. Step 2: Convert to fraction form
    256.52/383.88 = 238.40/x
  3. Step 3: Cross multiply
    256.52x = 383.88 × 238.40
  4. Step 4: Simplify right side
    256.52x = 91,516.99
  5. Step 5: Solve for x
    x = 91,516.99/256.52
  6. Step 6: Final answer
    x = 356.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.