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Finding the Fourth Proportional to 667.72, 921.58 and 402.18

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Solution

The fourth proportional to 667.72, 921.58 and 402.18 is: 555.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.72 : 921.58 = 402.18 : x
  2. Step 2: Convert to fraction form
    667.72/921.58 = 402.18/x
  3. Step 3: Cross multiply
    667.72x = 921.58 × 402.18
  4. Step 4: Simplify right side
    667.72x = 370,641.04
  5. Step 5: Solve for x
    x = 370,641.04/667.72
  6. Step 6: Final answer
    x = 555.08

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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.