Home / 2,128.14-3,188.97-972.54

Finding the Fourth Proportional to 2,128.14, 3,188.97 and 972.54

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Solution

The fourth proportional to 2,128.14, 3,188.97 and 972.54 is: 1,457.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.14 : 3,188.97 = 972.54 : x
  2. Step 2: Convert to fraction form
    2,128.14/3,188.97 = 972.54/x
  3. Step 3: Cross multiply
    2,128.14x = 3,188.97 × 972.54
  4. Step 4: Simplify right side
    2,128.14x = 3,101,400.88
  5. Step 5: Solve for x
    x = 3,101,400.88/2,128.14
  6. Step 6: Final answer
    x = 1,457.33

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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.