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Finding the Fourth Proportional to 7,141.78, 9,856.11 and 3,998.20

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Solution

The fourth proportional to 7,141.78, 9,856.11 and 3,998.20 is: 5,517.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,141.78 : 9,856.11 = 3,998.20 : x
  2. Step 2: Convert to fraction form
    7,141.78/9,856.11 = 3,998.20/x
  3. Step 3: Cross multiply
    7,141.78x = 9,856.11 × 3,998.20
  4. Step 4: Simplify right side
    7,141.78x = 39,406,699.00
  5. Step 5: Solve for x
    x = 39,406,699.00/7,141.78
  6. Step 6: Final answer
    x = 5,517.77

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Half scale
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.