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Finding the Fourth Proportional to 256.21, 383.18 and 193.72

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Solution

The fourth proportional to 256.21, 383.18 and 193.72 is: 289.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.21 : 383.18 = 193.72 : x
  2. Step 2: Convert to fraction form
    256.21/383.18 = 193.72/x
  3. Step 3: Cross multiply
    256.21x = 383.18 × 193.72
  4. Step 4: Simplify right side
    256.21x = 74,227.70
  5. Step 5: Solve for x
    x = 74,227.70/256.21
  6. Step 6: Final answer
    x = 289.72

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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.