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Finding the Fourth Proportional to 512.75, 769.12 and 147.49

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Solution

The fourth proportional to 512.75, 769.12 and 147.49 is: 221.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.75 : 769.12 = 147.49 : x
  2. Step 2: Convert to fraction form
    512.75/769.12 = 147.49/x
  3. Step 3: Cross multiply
    512.75x = 769.12 × 147.49
  4. Step 4: Simplify right side
    512.75x = 113,437.51
  5. Step 5: Solve for x
    x = 113,437.51/512.75
  6. Step 6: Final answer
    x = 221.23

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Double scale
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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.