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Finding the Fourth Proportional to 425.33, 640.90 and 349.99

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Solution

The fourth proportional to 425.33, 640.90 and 349.99 is: 527.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.33 : 640.90 = 349.99 : x
  2. Step 2: Convert to fraction form
    425.33/640.90 = 349.99/x
  3. Step 3: Cross multiply
    425.33x = 640.90 × 349.99
  4. Step 4: Simplify right side
    425.33x = 224,305.46
  5. Step 5: Solve for x
    x = 224,305.46/425.33
  6. Step 6: Final answer
    x = 527.36

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.