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Finding the Fourth Proportional to 667.45, 920.80 and 418.60

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Solution

The fourth proportional to 667.45, 920.80 and 418.60 is: 577.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.45 : 920.80 = 418.60 : x
  2. Step 2: Convert to fraction form
    667.45/920.80 = 418.60/x
  3. Step 3: Cross multiply
    667.45x = 920.80 × 418.60
  4. Step 4: Simplify right side
    667.45x = 385,444.79
  5. Step 5: Solve for x
    x = 385,444.79/667.45
  6. Step 6: Final answer
    x = 577.49

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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.