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Finding the Fourth Proportional to 1,281.44, 1,921.32 and 664.64

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Solution

The fourth proportional to 1,281.44, 1,921.32 and 664.64 is: 996.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.44 : 1,921.32 = 664.64 : x
  2. Step 2: Convert to fraction form
    1,281.44/1,921.32 = 664.64/x
  3. Step 3: Cross multiply
    1,281.44x = 1,921.32 × 664.64
  4. Step 4: Simplify right side
    1,281.44x = 1,276,986.12
  5. Step 5: Solve for x
    x = 1,276,986.12/1,281.44
  6. Step 6: Final answer
    x = 996.52

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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.