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Finding the Fourth Proportional to 512.88, 769.47 and 256.38

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Solution

The fourth proportional to 512.88, 769.47 and 256.38 is: 384.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.88 : 769.47 = 256.38 : x
  2. Step 2: Convert to fraction form
    512.88/769.47 = 256.38/x
  3. Step 3: Cross multiply
    512.88x = 769.47 × 256.38
  4. Step 4: Simplify right side
    512.88x = 197,276.72
  5. Step 5: Solve for x
    x = 197,276.72/512.88
  6. Step 6: Final answer
    x = 384.64

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Similar ratio
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1.5x scale

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.