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Finding the Fourth Proportional to 1,226.75, 1,691.72 and 784.49

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Solution

The fourth proportional to 1,226.75, 1,691.72 and 784.49 is: 1,081.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.75 : 1,691.72 = 784.49 : x
  2. Step 2: Convert to fraction form
    1,226.75/1,691.72 = 784.49/x
  3. Step 3: Cross multiply
    1,226.75x = 1,691.72 × 784.49
  4. Step 4: Simplify right side
    1,226.75x = 1,327,133.50
  5. Step 5: Solve for x
    x = 1,327,133.50/1,226.75
  6. Step 6: Final answer
    x = 1,081.83

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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.