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Finding the Fourth Proportional to 3,910.92, 5,866.20 and 989.28

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Solution

The fourth proportional to 3,910.92, 5,866.20 and 989.28 is: 1,483.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,910.92 : 5,866.20 = 989.28 : x
  2. Step 2: Convert to fraction form
    3,910.92/5,866.20 = 989.28/x
  3. Step 3: Cross multiply
    3,910.92x = 5,866.20 × 989.28
  4. Step 4: Simplify right side
    3,910.92x = 5,803,314.34
  5. Step 5: Solve for x
    x = 5,803,314.34/3,910.92
  6. Step 6: Final answer
    x = 1,483.87

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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.