Home / 1,181.70-1,769.67-1,129.05

Finding the Fourth Proportional to 1,181.70, 1,769.67 and 1,129.05

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Solution

The fourth proportional to 1,181.70, 1,769.67 and 1,129.05 is: 1,690.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.70 : 1,769.67 = 1,129.05 : x
  2. Step 2: Convert to fraction form
    1,181.70/1,769.67 = 1,129.05/x
  3. Step 3: Cross multiply
    1,181.70x = 1,769.67 × 1,129.05
  4. Step 4: Simplify right side
    1,181.70x = 1,998,045.91
  5. Step 5: Solve for x
    x = 1,998,045.91/1,181.70
  6. Step 6: Final answer
    x = 1,690.82

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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.