Home / 5,415.19-8,122.78-1,311.19

Finding the Fourth Proportional to 5,415.19, 8,122.78 and 1,311.19

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Solution

The fourth proportional to 5,415.19, 8,122.78 and 1,311.19 is: 1,966.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,415.19 : 8,122.78 = 1,311.19 : x
  2. Step 2: Convert to fraction form
    5,415.19/8,122.78 = 1,311.19/x
  3. Step 3: Cross multiply
    5,415.19x = 8,122.78 × 1,311.19
  4. Step 4: Simplify right side
    5,415.19x = 10,650,489.24
  5. Step 5: Solve for x
    x = 10,650,489.24/5,415.19
  6. Step 6: Final answer
    x = 1,966.78

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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.