Home / 1,189.46-1,639.13-857.25

Finding the Fourth Proportional to 1,189.46, 1,639.13 and 857.25

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Solution

The fourth proportional to 1,189.46, 1,639.13 and 857.25 is: 1,181.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.46 : 1,639.13 = 857.25 : x
  2. Step 2: Convert to fraction form
    1,189.46/1,639.13 = 857.25/x
  3. Step 3: Cross multiply
    1,189.46x = 1,639.13 × 857.25
  4. Step 4: Simplify right side
    1,189.46x = 1,405,139.91
  5. Step 5: Solve for x
    x = 1,405,139.91/1,189.46
  6. Step 6: Final answer
    x = 1,181.33

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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.