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Finding the Fourth Proportional to 3,910.85, 5,865.80 and 989.18

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Solution

The fourth proportional to 3,910.85, 5,865.80 and 989.18 is: 1,483.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,910.85 : 5,865.80 = 989.18 : x
  2. Step 2: Convert to fraction form
    3,910.85/5,865.80 = 989.18/x
  3. Step 3: Cross multiply
    3,910.85x = 5,865.80 × 989.18
  4. Step 4: Simplify right side
    3,910.85x = 5,802,297.77
  5. Step 5: Solve for x
    x = 5,802,297.77/3,910.85
  6. Step 6: Final answer
    x = 1,483.64

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1.5x scale

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.