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Finding the Fourth Proportional to 667.14, 920.86 and 405.34

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Solution

The fourth proportional to 667.14, 920.86 and 405.34 is: 559.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.14 : 920.86 = 405.34 : x
  2. Step 2: Convert to fraction form
    667.14/920.86 = 405.34/x
  3. Step 3: Cross multiply
    667.14x = 920.86 × 405.34
  4. Step 4: Simplify right side
    667.14x = 373,261.39
  5. Step 5: Solve for x
    x = 373,261.39/667.14
  6. Step 6: Final answer
    x = 559.49

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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.