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Finding the Fourth Proportional to 1,380.80, 2,071.20 and 832.70

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Solution

The fourth proportional to 1,380.80, 2,071.20 and 832.70 is: 1,249.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.80 : 2,071.20 = 832.70 : x
  2. Step 2: Convert to fraction form
    1,380.80/2,071.20 = 832.70/x
  3. Step 3: Cross multiply
    1,380.80x = 2,071.20 × 832.70
  4. Step 4: Simplify right side
    1,380.80x = 1,724,688.24
  5. Step 5: Solve for x
    x = 1,724,688.24/1,380.80
  6. Step 6: Final answer
    x = 1,249.05

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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.