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Finding the Fourth Proportional to 921.68, 1,381.44 and 911.41

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Solution

The fourth proportional to 921.68, 1,381.44 and 911.41 is: 1,366.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.68 : 1,381.44 = 911.41 : x
  2. Step 2: Convert to fraction form
    921.68/1,381.44 = 911.41/x
  3. Step 3: Cross multiply
    921.68x = 1,381.44 × 911.41
  4. Step 4: Simplify right side
    921.68x = 1,259,053.07
  5. Step 5: Solve for x
    x = 1,259,053.07/921.68
  6. Step 6: Final answer
    x = 1,366.03

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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.