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Finding the Fourth Proportional to 667.48, 921.20 and 405.50

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Solution

The fourth proportional to 667.48, 921.20 and 405.50 is: 559.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.48 : 921.20 = 405.50 : x
  2. Step 2: Convert to fraction form
    667.48/921.20 = 405.50/x
  3. Step 3: Cross multiply
    667.48x = 921.20 × 405.50
  4. Step 4: Simplify right side
    667.48x = 373,546.60
  5. Step 5: Solve for x
    x = 373,546.60/667.48
  6. Step 6: Final answer
    x = 559.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.