Home / 1,311.16-1,817.19-1,286.55

Finding the Fourth Proportional to 1,311.16, 1,817.19 and 1,286.55

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Solution

The fourth proportional to 1,311.16, 1,817.19 and 1,286.55 is: 1,783.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.16 : 1,817.19 = 1,286.55 : x
  2. Step 2: Convert to fraction form
    1,311.16/1,817.19 = 1,286.55/x
  3. Step 3: Cross multiply
    1,311.16x = 1,817.19 × 1,286.55
  4. Step 4: Simplify right side
    1,311.16x = 2,337,905.79
  5. Step 5: Solve for x
    x = 2,337,905.79/1,311.16
  6. Step 6: Final answer
    x = 1,783.08

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.