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Finding the Fourth Proportional to 1,281.67, 1,921.83 and 664.76

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Solution

The fourth proportional to 1,281.67, 1,921.83 and 664.76 is: 996.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.67 : 1,921.83 = 664.76 : x
  2. Step 2: Convert to fraction form
    1,281.67/1,921.83 = 664.76/x
  3. Step 3: Cross multiply
    1,281.67x = 1,921.83 × 664.76
  4. Step 4: Simplify right side
    1,281.67x = 1,277,547.21
  5. Step 5: Solve for x
    x = 1,277,547.21/1,281.67
  6. Step 6: Final answer
    x = 996.78

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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.