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Finding the Fourth Proportional to 834.20, 1,251.39 and 286.32

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Solution

The fourth proportional to 834.20, 1,251.39 and 286.32 is: 429.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.20 : 1,251.39 = 286.32 : x
  2. Step 2: Convert to fraction form
    834.20/1,251.39 = 286.32/x
  3. Step 3: Cross multiply
    834.20x = 1,251.39 × 286.32
  4. Step 4: Simplify right side
    834.20x = 358,292.09
  5. Step 5: Solve for x
    x = 358,292.09/834.20
  6. Step 6: Final answer
    x = 429.50

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Double scale
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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.