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Finding the Fourth Proportional to 667.32, 920.61 and 418.74

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Solution

The fourth proportional to 667.32, 920.61 and 418.74 is: 577.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.32 : 920.61 = 418.74 : x
  2. Step 2: Convert to fraction form
    667.32/920.61 = 418.74/x
  3. Step 3: Cross multiply
    667.32x = 920.61 × 418.74
  4. Step 4: Simplify right side
    667.32x = 385,496.23
  5. Step 5: Solve for x
    x = 385,496.23/667.32
  6. Step 6: Final answer
    x = 577.68

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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.