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Finding the Fourth Proportional to 425.43, 639.41 and 352.78

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Solution

The fourth proportional to 425.43, 639.41 and 352.78 is: 530.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.43 : 639.41 = 352.78 : x
  2. Step 2: Convert to fraction form
    425.43/639.41 = 352.78/x
  3. Step 3: Cross multiply
    425.43x = 639.41 × 352.78
  4. Step 4: Simplify right side
    425.43x = 225,569.99
  5. Step 5: Solve for x
    x = 225,569.99/425.43
  6. Step 6: Final answer
    x = 530.22

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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.