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Finding the Fourth Proportional to 425.89, 639.65 and 243.64

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Solution

The fourth proportional to 425.89, 639.65 and 243.64 is: 365.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.89 : 639.65 = 243.64 : x
  2. Step 2: Convert to fraction form
    425.89/639.65 = 243.64/x
  3. Step 3: Cross multiply
    425.89x = 639.65 × 243.64
  4. Step 4: Simplify right side
    425.89x = 155,844.33
  5. Step 5: Solve for x
    x = 155,844.33/425.89
  6. Step 6: Final answer
    x = 365.93

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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.