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Finding the Fourth Proportional to 578.81, 868.20 and 145.96

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Solution

The fourth proportional to 578.81, 868.20 and 145.96 is: 218.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.81 : 868.20 = 145.96 : x
  2. Step 2: Convert to fraction form
    578.81/868.20 = 145.96/x
  3. Step 3: Cross multiply
    578.81x = 868.20 × 145.96
  4. Step 4: Simplify right side
    578.81x = 126,722.47
  5. Step 5: Solve for x
    x = 126,722.47/578.81
  6. Step 6: Final answer
    x = 218.94

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Double scale
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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.