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Finding the Fourth Proportional to 578.80, 868.16 and 145.92

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Solution

The fourth proportional to 578.80, 868.16 and 145.92 is: 218.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.80 : 868.16 = 145.92 : x
  2. Step 2: Convert to fraction form
    578.80/868.16 = 145.92/x
  3. Step 3: Cross multiply
    578.80x = 868.16 × 145.92
  4. Step 4: Simplify right side
    578.80x = 126,681.91
  5. Step 5: Solve for x
    x = 126,681.91/578.80
  6. Step 6: Final answer
    x = 218.87

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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.