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Finding the Fourth Proportional to 667.80, 921.44 and 402.16

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Solution

The fourth proportional to 667.80, 921.44 and 402.16 is: 554.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.80 : 921.44 = 402.16 : x
  2. Step 2: Convert to fraction form
    667.80/921.44 = 402.16/x
  3. Step 3: Cross multiply
    667.80x = 921.44 × 402.16
  4. Step 4: Simplify right side
    667.80x = 370,566.31
  5. Step 5: Solve for x
    x = 370,566.31/667.80
  6. Step 6: Final answer
    x = 554.91

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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.