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Finding the Fourth Proportional to 513.09, 769.58 and 253.11

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Solution

The fourth proportional to 513.09, 769.58 and 253.11 is: 379.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.09 : 769.58 = 253.11 : x
  2. Step 2: Convert to fraction form
    513.09/769.58 = 253.11/x
  3. Step 3: Cross multiply
    513.09x = 769.58 × 253.11
  4. Step 4: Simplify right side
    513.09x = 194,785.92
  5. Step 5: Solve for x
    x = 194,785.92/513.09
  6. Step 6: Final answer
    x = 379.63

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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.