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Finding the Fourth Proportional to 667.90, 921.74 and 402.38

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Solution

The fourth proportional to 667.90, 921.74 and 402.38 is: 555.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.90 : 921.74 = 402.38 : x
  2. Step 2: Convert to fraction form
    667.90/921.74 = 402.38/x
  3. Step 3: Cross multiply
    667.90x = 921.74 × 402.38
  4. Step 4: Simplify right side
    667.90x = 370,890.03
  5. Step 5: Solve for x
    x = 370,890.03/667.90
  6. Step 6: Final answer
    x = 555.31

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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.