Home / 1,128.20-1,556.42-865.76

Finding the Fourth Proportional to 1,128.20, 1,556.42 and 865.76

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Solution

The fourth proportional to 1,128.20, 1,556.42 and 865.76 is: 1,194.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.20 : 1,556.42 = 865.76 : x
  2. Step 2: Convert to fraction form
    1,128.20/1,556.42 = 865.76/x
  3. Step 3: Cross multiply
    1,128.20x = 1,556.42 × 865.76
  4. Step 4: Simplify right side
    1,128.20x = 1,347,474.07
  5. Step 5: Solve for x
    x = 1,347,474.07/1,128.20
  6. Step 6: Final answer
    x = 1,194.36

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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.