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Finding the Fourth Proportional to 921.25, 1,381.97 and 305.14

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Solution

The fourth proportional to 921.25, 1,381.97 and 305.14 is: 457.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.25 : 1,381.97 = 305.14 : x
  2. Step 2: Convert to fraction form
    921.25/1,381.97 = 305.14/x
  3. Step 3: Cross multiply
    921.25x = 1,381.97 × 305.14
  4. Step 4: Simplify right side
    921.25x = 421,694.33
  5. Step 5: Solve for x
    x = 421,694.33/921.25
  6. Step 6: Final answer
    x = 457.74

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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.