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Finding the Fourth Proportional to 667.08, 921.15 and 418.83

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Solution

The fourth proportional to 667.08, 921.15 and 418.83 is: 578.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.08 : 921.15 = 418.83 : x
  2. Step 2: Convert to fraction form
    667.08/921.15 = 418.83/x
  3. Step 3: Cross multiply
    667.08x = 921.15 × 418.83
  4. Step 4: Simplify right side
    667.08x = 385,799.60
  5. Step 5: Solve for x
    x = 385,799.60/667.08
  6. Step 6: Final answer
    x = 578.34

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1.5x scale

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.