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Finding the Fourth Proportional to 578.87, 868.18 and 188.78

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Solution

The fourth proportional to 578.87, 868.18 and 188.78 is: 283.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.87 : 868.18 = 188.78 : x
  2. Step 2: Convert to fraction form
    578.87/868.18 = 188.78/x
  3. Step 3: Cross multiply
    578.87x = 868.18 × 188.78
  4. Step 4: Simplify right side
    578.87x = 163,890.03
  5. Step 5: Solve for x
    x = 163,890.03/578.87
  6. Step 6: Final answer
    x = 283.12

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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.