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Finding the Fourth Proportional to 1,281.52, 1,921.67 and 664.60

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Solution

The fourth proportional to 1,281.52, 1,921.67 and 664.60 is: 996.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.52 : 1,921.67 = 664.60 : x
  2. Step 2: Convert to fraction form
    1,281.52/1,921.67 = 664.60/x
  3. Step 3: Cross multiply
    1,281.52x = 1,921.67 × 664.60
  4. Step 4: Simplify right side
    1,281.52x = 1,277,141.88
  5. Step 5: Solve for x
    x = 1,277,141.88/1,281.52
  6. Step 6: Final answer
    x = 996.58

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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.