Home / 1,128.13-1,556.79-630.81

Finding the Fourth Proportional to 1,128.13, 1,556.79 and 630.81

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Solution

The fourth proportional to 1,128.13, 1,556.79 and 630.81 is: 870.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.13 : 1,556.79 = 630.81 : x
  2. Step 2: Convert to fraction form
    1,128.13/1,556.79 = 630.81/x
  3. Step 3: Cross multiply
    1,128.13x = 1,556.79 × 630.81
  4. Step 4: Simplify right side
    1,128.13x = 982,036.33
  5. Step 5: Solve for x
    x = 982,036.33/1,128.13
  6. Step 6: Final answer
    x = 870.50

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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.