Home / 1,128.77-1,556.25-939.71

Finding the Fourth Proportional to 1,128.77, 1,556.25 and 939.71

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Solution

The fourth proportional to 1,128.77, 1,556.25 and 939.71 is: 1,295.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.77 : 1,556.25 = 939.71 : x
  2. Step 2: Convert to fraction form
    1,128.77/1,556.25 = 939.71/x
  3. Step 3: Cross multiply
    1,128.77x = 1,556.25 × 939.71
  4. Step 4: Simplify right side
    1,128.77x = 1,462,418.26
  5. Step 5: Solve for x
    x = 1,462,418.26/1,128.77
  6. Step 6: Final answer
    x = 1,295.58

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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.