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Finding the Fourth Proportional to 667.58, 921.20 and 402.12

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Solution

The fourth proportional to 667.58, 921.20 and 402.12 is: 554.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.58 : 921.20 = 402.12 : x
  2. Step 2: Convert to fraction form
    667.58/921.20 = 402.12/x
  3. Step 3: Cross multiply
    667.58x = 921.20 × 402.12
  4. Step 4: Simplify right side
    667.58x = 370,430.93
  5. Step 5: Solve for x
    x = 370,430.93/667.58
  6. Step 6: Final answer
    x = 554.89

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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.