Home / 1,128.20-1,556.87-630.83

Finding the Fourth Proportional to 1,128.20, 1,556.87 and 630.83

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Solution

The fourth proportional to 1,128.20, 1,556.87 and 630.83 is: 870.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.20 : 1,556.87 = 630.83 : x
  2. Step 2: Convert to fraction form
    1,128.20/1,556.87 = 630.83/x
  3. Step 3: Cross multiply
    1,128.20x = 1,556.87 × 630.83
  4. Step 4: Simplify right side
    1,128.20x = 982,121.04
  5. Step 5: Solve for x
    x = 982,121.04/1,128.20
  6. Step 6: Final answer
    x = 870.52

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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.