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Finding the Fourth Proportional to 427.60, 640.56 and 354.68

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Solution

The fourth proportional to 427.60, 640.56 and 354.68 is: 531.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.60 : 640.56 = 354.68 : x
  2. Step 2: Convert to fraction form
    427.60/640.56 = 354.68/x
  3. Step 3: Cross multiply
    427.60x = 640.56 × 354.68
  4. Step 4: Simplify right side
    427.60x = 227,193.82
  5. Step 5: Solve for x
    x = 227,193.82/427.60
  6. Step 6: Final answer
    x = 531.32

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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.