Home / 1,229.40-1,696.70-1,191.12

Finding the Fourth Proportional to 1,229.40, 1,696.70 and 1,191.12

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Solution

The fourth proportional to 1,229.40, 1,696.70 and 1,191.12 is: 1,643.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.40 : 1,696.70 = 1,191.12 : x
  2. Step 2: Convert to fraction form
    1,229.40/1,696.70 = 1,191.12/x
  3. Step 3: Cross multiply
    1,229.40x = 1,696.70 × 1,191.12
  4. Step 4: Simplify right side
    1,229.40x = 2,020,973.30
  5. Step 5: Solve for x
    x = 2,020,973.30/1,229.40
  6. Step 6: Final answer
    x = 1,643.87

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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.