Home / 1,172.28-1,759.38-1,128.12

Finding the Fourth Proportional to 1,172.28, 1,759.38 and 1,128.12

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Solution

The fourth proportional to 1,172.28, 1,759.38 and 1,128.12 is: 1,693.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.28 : 1,759.38 = 1,128.12 : x
  2. Step 2: Convert to fraction form
    1,172.28/1,759.38 = 1,128.12/x
  3. Step 3: Cross multiply
    1,172.28x = 1,759.38 × 1,128.12
  4. Step 4: Simplify right side
    1,172.28x = 1,984,791.77
  5. Step 5: Solve for x
    x = 1,984,791.77/1,172.28
  6. Step 6: Final answer
    x = 1,693.10

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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.