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Finding the Fourth Proportional to 19,679.76, 29,496.96 and 7,980.12

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Solution

The fourth proportional to 19,679.76, 29,496.96 and 7,980.12 is: 11,960.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,679.76 : 29,496.96 = 7,980.12 : x
  2. Step 2: Convert to fraction form
    19,679.76/29,496.96 = 7,980.12/x
  3. Step 3: Cross multiply
    19,679.76x = 29,496.96 × 7,980.12
  4. Step 4: Simplify right side
    19,679.76x = 235,389,280.44
  5. Step 5: Solve for x
    x = 235,389,280.44/19,679.76
  6. Step 6: Final answer
    x = 11,960.98

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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.