Home / 1,128.09-1,556.60-630.68

Finding the Fourth Proportional to 1,128.09, 1,556.60 and 630.68

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Solution

The fourth proportional to 1,128.09, 1,556.60 and 630.68 is: 870.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.09 : 1,556.60 = 630.68 : x
  2. Step 2: Convert to fraction form
    1,128.09/1,556.60 = 630.68/x
  3. Step 3: Cross multiply
    1,128.09x = 1,556.60 × 630.68
  4. Step 4: Simplify right side
    1,128.09x = 981,716.49
  5. Step 5: Solve for x
    x = 981,716.49/1,128.09
  6. Step 6: Final answer
    x = 870.25

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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.