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Finding the Fourth Proportional to 383.85, 575.78 and 140.28

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Solution

The fourth proportional to 383.85, 575.78 and 140.28 is: 210.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.85 : 575.78 = 140.28 : x
  2. Step 2: Convert to fraction form
    383.85/575.78 = 140.28/x
  3. Step 3: Cross multiply
    383.85x = 575.78 × 140.28
  4. Step 4: Simplify right side
    383.85x = 80,767.19
  5. Step 5: Solve for x
    x = 80,767.19/383.85
  6. Step 6: Final answer
    x = 210.41

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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.