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Finding the Fourth Proportional to 1,128.22, 1,556.67 and 662.38

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Solution

The fourth proportional to 1,128.22, 1,556.67 and 662.38 is: 913.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.22 : 1,556.67 = 662.38 : x
  2. Step 2: Convert to fraction form
    1,128.22/1,556.67 = 662.38/x
  3. Step 3: Cross multiply
    1,128.22x = 1,556.67 × 662.38
  4. Step 4: Simplify right side
    1,128.22x = 1,031,107.07
  5. Step 5: Solve for x
    x = 1,031,107.07/1,128.22
  6. Step 6: Final answer
    x = 913.92

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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.