Home / 12,122.60-16,728.90-7,930.76

Finding the Fourth Proportional to 12,122.60, 16,728.90 and 7,930.76

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Solution

The fourth proportional to 12,122.60, 16,728.90 and 7,930.76 is: 10,944.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,122.60 : 16,728.90 = 7,930.76 : x
  2. Step 2: Convert to fraction form
    12,122.60/16,728.90 = 7,930.76/x
  3. Step 3: Cross multiply
    12,122.60x = 16,728.90 × 7,930.76
  4. Step 4: Simplify right side
    12,122.60x = 132,672,890.96
  5. Step 5: Solve for x
    x = 132,672,890.96/12,122.60
  6. Step 6: Final answer
    x = 10,944.26

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Half scale
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Double scale
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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.