Home / 1,185.91-1,780.68-1,057.12

Finding the Fourth Proportional to 1,185.91, 1,780.68 and 1,057.12

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Solution

The fourth proportional to 1,185.91, 1,780.68 and 1,057.12 is: 1,587.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.91 : 1,780.68 = 1,057.12 : x
  2. Step 2: Convert to fraction form
    1,185.91/1,780.68 = 1,057.12/x
  3. Step 3: Cross multiply
    1,185.91x = 1,780.68 × 1,057.12
  4. Step 4: Simplify right side
    1,185.91x = 1,882,391.95
  5. Step 5: Solve for x
    x = 1,882,391.95/1,185.91
  6. Step 6: Final answer
    x = 1,587.30

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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.