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Finding the Fourth Proportional to 382.90, 574.53 and 139.45

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Solution

The fourth proportional to 382.90, 574.53 and 139.45 is: 209.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.90 : 574.53 = 139.45 : x
  2. Step 2: Convert to fraction form
    382.90/574.53 = 139.45/x
  3. Step 3: Cross multiply
    382.90x = 574.53 × 139.45
  4. Step 4: Simplify right side
    382.90x = 80,118.21
  5. Step 5: Solve for x
    x = 80,118.21/382.90
  6. Step 6: Final answer
    x = 209.24

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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.