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Finding the Fourth Proportional to 425.40, 636.90 and 382.20

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Solution

The fourth proportional to 425.40, 636.90 and 382.20 is: 572.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.40 : 636.90 = 382.20 : x
  2. Step 2: Convert to fraction form
    425.40/636.90 = 382.20/x
  3. Step 3: Cross multiply
    425.40x = 636.90 × 382.20
  4. Step 4: Simplify right side
    425.40x = 243,423.18
  5. Step 5: Solve for x
    x = 243,423.18/425.40
  6. Step 6: Final answer
    x = 572.22

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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.