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Finding the Fourth Proportional to 425.55, 638.19 and 243.03

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Solution

The fourth proportional to 425.55, 638.19 and 243.03 is: 364.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.55 : 638.19 = 243.03 : x
  2. Step 2: Convert to fraction form
    425.55/638.19 = 243.03/x
  3. Step 3: Cross multiply
    425.55x = 638.19 × 243.03
  4. Step 4: Simplify right side
    425.55x = 155,099.32
  5. Step 5: Solve for x
    x = 155,099.32/425.55
  6. Step 6: Final answer
    x = 364.47

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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.