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Finding the Fourth Proportional to 383.46, 574.84 and 139.81

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Solution

The fourth proportional to 383.46, 574.84 and 139.81 is: 209.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.46 : 574.84 = 139.81 : x
  2. Step 2: Convert to fraction form
    383.46/574.84 = 139.81/x
  3. Step 3: Cross multiply
    383.46x = 574.84 × 139.81
  4. Step 4: Simplify right side
    383.46x = 80,368.38
  5. Step 5: Solve for x
    x = 80,368.38/383.46
  6. Step 6: Final answer
    x = 209.59

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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.