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Finding the Fourth Proportional to 5,491.14, 8,234.65 and 1,980.20

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Solution

The fourth proportional to 5,491.14, 8,234.65 and 1,980.20 is: 2,969.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,491.14 : 8,234.65 = 1,980.20 : x
  2. Step 2: Convert to fraction form
    5,491.14/8,234.65 = 1,980.20/x
  3. Step 3: Cross multiply
    5,491.14x = 8,234.65 × 1,980.20
  4. Step 4: Simplify right side
    5,491.14x = 16,306,253.93
  5. Step 5: Solve for x
    x = 16,306,253.93/5,491.14
  6. Step 6: Final answer
    x = 2,969.56

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