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Finding the Fourth Proportional to 1,921.28, 2,881.84 and 553.28

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Solution

The fourth proportional to 1,921.28, 2,881.84 and 553.28 is: 829.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.28 : 2,881.84 = 553.28 : x
  2. Step 2: Convert to fraction form
    1,921.28/2,881.84 = 553.28/x
  3. Step 3: Cross multiply
    1,921.28x = 2,881.84 × 553.28
  4. Step 4: Simplify right side
    1,921.28x = 1,594,464.44
  5. Step 5: Solve for x
    x = 1,594,464.44/1,921.28
  6. Step 6: Final answer
    x = 829.90

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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.