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Finding the Fourth Proportional to 1,282.88, 1,920.15 and 665.70

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Solution

The fourth proportional to 1,282.88, 1,920.15 and 665.70 is: 996.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.88 : 1,920.15 = 665.70 : x
  2. Step 2: Convert to fraction form
    1,282.88/1,920.15 = 665.70/x
  3. Step 3: Cross multiply
    1,282.88x = 1,920.15 × 665.70
  4. Step 4: Simplify right side
    1,282.88x = 1,278,243.86
  5. Step 5: Solve for x
    x = 1,278,243.86/1,282.88
  6. Step 6: Final answer
    x = 996.39

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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.