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Finding the Fourth Proportional to 513.16, 769.74 and 128.41

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Solution

The fourth proportional to 513.16, 769.74 and 128.41 is: 192.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.16 : 769.74 = 128.41 : x
  2. Step 2: Convert to fraction form
    513.16/769.74 = 128.41/x
  3. Step 3: Cross multiply
    513.16x = 769.74 × 128.41
  4. Step 4: Simplify right side
    513.16x = 98,842.31
  5. Step 5: Solve for x
    x = 98,842.31/513.16
  6. Step 6: Final answer
    x = 192.62

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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.