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Finding the Fourth Proportional to 1,006.73, 1,508.07 and 640.21

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Solution

The fourth proportional to 1,006.73, 1,508.07 and 640.21 is: 959.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.73 : 1,508.07 = 640.21 : x
  2. Step 2: Convert to fraction form
    1,006.73/1,508.07 = 640.21/x
  3. Step 3: Cross multiply
    1,006.73x = 1,508.07 × 640.21
  4. Step 4: Simplify right side
    1,006.73x = 965,470.75
  5. Step 5: Solve for x
    x = 965,470.75/1,006.73
  6. Step 6: Final answer
    x = 959.02

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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.