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Finding the Fourth Proportional to 427.34, 640.89 and 291.26

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Solution

The fourth proportional to 427.34, 640.89 and 291.26 is: 436.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.34 : 640.89 = 291.26 : x
  2. Step 2: Convert to fraction form
    427.34/640.89 = 291.26/x
  3. Step 3: Cross multiply
    427.34x = 640.89 × 291.26
  4. Step 4: Simplify right side
    427.34x = 186,665.62
  5. Step 5: Solve for x
    x = 186,665.62/427.34
  6. Step 6: Final answer
    x = 436.81

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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.