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Finding the Fourth Proportional to 511.11, 766.67 and 145.90

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Solution

The fourth proportional to 511.11, 766.67 and 145.90 is: 218.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.11 : 766.67 = 145.90 : x
  2. Step 2: Convert to fraction form
    511.11/766.67 = 145.90/x
  3. Step 3: Cross multiply
    511.11x = 766.67 × 145.90
  4. Step 4: Simplify right side
    511.11x = 111,857.15
  5. Step 5: Solve for x
    x = 111,857.15/511.11
  6. Step 6: Final answer
    x = 218.85

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Double scale
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Similar ratio
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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.