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Finding the Fourth Proportional to 1,128.66, 1,556.96 and 755.64

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Solution

The fourth proportional to 1,128.66, 1,556.96 and 755.64 is: 1,042.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.66 : 1,556.96 = 755.64 : x
  2. Step 2: Convert to fraction form
    1,128.66/1,556.96 = 755.64/x
  3. Step 3: Cross multiply
    1,128.66x = 1,556.96 × 755.64
  4. Step 4: Simplify right side
    1,128.66x = 1,176,501.25
  5. Step 5: Solve for x
    x = 1,176,501.25/1,128.66
  6. Step 6: Final answer
    x = 1,042.39

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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.