Home / 9,121.72-12,586.92-5,142.76

Finding the Fourth Proportional to 9,121.72, 12,586.92 and 5,142.76

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Solution

The fourth proportional to 9,121.72, 12,586.92 and 5,142.76 is: 7,096.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,121.72 : 12,586.92 = 5,142.76 : x
  2. Step 2: Convert to fraction form
    9,121.72/12,586.92 = 5,142.76/x
  3. Step 3: Cross multiply
    9,121.72x = 12,586.92 × 5,142.76
  4. Step 4: Simplify right side
    9,121.72x = 64,731,508.70
  5. Step 5: Solve for x
    x = 64,731,508.70/9,121.72
  6. Step 6: Final answer
    x = 7,096.41

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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.