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Finding the Fourth Proportional to 256.20, 383.76 and 207.60

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Solution

The fourth proportional to 256.20, 383.76 and 207.60 is: 310.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.20 : 383.76 = 207.60 : x
  2. Step 2: Convert to fraction form
    256.20/383.76 = 207.60/x
  3. Step 3: Cross multiply
    256.20x = 383.76 × 207.60
  4. Step 4: Simplify right side
    256.20x = 79,668.58
  5. Step 5: Solve for x
    x = 79,668.58/256.20
  6. Step 6: Final answer
    x = 310.96

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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.