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Finding the Fourth Proportional to 382.40, 572.40 and 274.40

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Solution

The fourth proportional to 382.40, 572.40 and 274.40 is: 410.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.40 : 572.40 = 274.40 : x
  2. Step 2: Convert to fraction form
    382.40/572.40 = 274.40/x
  3. Step 3: Cross multiply
    382.40x = 572.40 × 274.40
  4. Step 4: Simplify right side
    382.40x = 157,066.56
  5. Step 5: Solve for x
    x = 157,066.56/382.40
  6. Step 6: Final answer
    x = 410.74

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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.