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Finding the Fourth Proportional to 667.64, 921.38 and 418.77

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Solution

The fourth proportional to 667.64, 921.38 and 418.77 is: 577.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.64 : 921.38 = 418.77 : x
  2. Step 2: Convert to fraction form
    667.64/921.38 = 418.77/x
  3. Step 3: Cross multiply
    667.64x = 921.38 × 418.77
  4. Step 4: Simplify right side
    667.64x = 385,844.21
  5. Step 5: Solve for x
    x = 385,844.21/667.64
  6. Step 6: Final answer
    x = 577.92

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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.