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Finding the Fourth Proportional to 921.21, 1,382.01 and 401.22

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Solution

The fourth proportional to 921.21, 1,382.01 and 401.22 is: 601.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.21 : 1,382.01 = 401.22 : x
  2. Step 2: Convert to fraction form
    921.21/1,382.01 = 401.22/x
  3. Step 3: Cross multiply
    921.21x = 1,382.01 × 401.22
  4. Step 4: Simplify right side
    921.21x = 554,490.05
  5. Step 5: Solve for x
    x = 554,490.05/921.21
  6. Step 6: Final answer
    x = 601.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.