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Finding the Fourth Proportional to 2,153.79, 3,232.10 and 921.44

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Solution

The fourth proportional to 2,153.79, 3,232.10 and 921.44 is: 1,382.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.79 : 3,232.10 = 921.44 : x
  2. Step 2: Convert to fraction form
    2,153.79/3,232.10 = 921.44/x
  3. Step 3: Cross multiply
    2,153.79x = 3,232.10 × 921.44
  4. Step 4: Simplify right side
    2,153.79x = 2,978,196.61
  5. Step 5: Solve for x
    x = 2,978,196.61/2,153.79
  6. Step 6: Final answer
    x = 1,382.77

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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.