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Finding the Fourth Proportional to 3,920.50, 5,880.75 and 998.58

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Solution

The fourth proportional to 3,920.50, 5,880.75 and 998.58 is: 1,497.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.50 : 5,880.75 = 998.58 : x
  2. Step 2: Convert to fraction form
    3,920.50/5,880.75 = 998.58/x
  3. Step 3: Cross multiply
    3,920.50x = 5,880.75 × 998.58
  4. Step 4: Simplify right side
    3,920.50x = 5,872,390.18
  5. Step 5: Solve for x
    x = 5,872,390.18/3,920.50
  6. Step 6: Final answer
    x = 1,497.87

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Double scale
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Similar ratio
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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.