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Finding the Fourth Proportional to 1,006.92, 1,388.85 and 820.41

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Solution

The fourth proportional to 1,006.92, 1,388.85 and 820.41 is: 1,131.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.92 : 1,388.85 = 820.41 : x
  2. Step 2: Convert to fraction form
    1,006.92/1,388.85 = 820.41/x
  3. Step 3: Cross multiply
    1,006.92x = 1,388.85 × 820.41
  4. Step 4: Simplify right side
    1,006.92x = 1,139,426.43
  5. Step 5: Solve for x
    x = 1,139,426.43/1,006.92
  6. Step 6: Final answer
    x = 1,131.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.