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Finding the Fourth Proportional to 425.64, 639.78 and 243.36

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Solution

The fourth proportional to 425.64, 639.78 and 243.36 is: 365.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.64 : 639.78 = 243.36 : x
  2. Step 2: Convert to fraction form
    425.64/639.78 = 243.36/x
  3. Step 3: Cross multiply
    425.64x = 639.78 × 243.36
  4. Step 4: Simplify right side
    425.64x = 155,696.86
  5. Step 5: Solve for x
    x = 155,696.86/425.64
  6. Step 6: Final answer
    x = 365.79

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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.