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Finding the Fourth Proportional to 667.98, 921.60 and 405.99

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Solution

The fourth proportional to 667.98, 921.60 and 405.99 is: 560.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.98 : 921.60 = 405.99 : x
  2. Step 2: Convert to fraction form
    667.98/921.60 = 405.99/x
  3. Step 3: Cross multiply
    667.98x = 921.60 × 405.99
  4. Step 4: Simplify right side
    667.98x = 374,160.38
  5. Step 5: Solve for x
    x = 374,160.38/667.98
  6. Step 6: Final answer
    x = 560.14

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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.