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Finding the Fourth Proportional to 1,128.13, 1,556.47 and 892.12

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Solution

The fourth proportional to 1,128.13, 1,556.47 and 892.12 is: 1,230.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.13 : 1,556.47 = 892.12 : x
  2. Step 2: Convert to fraction form
    1,128.13/1,556.47 = 892.12/x
  3. Step 3: Cross multiply
    1,128.13x = 1,556.47 × 892.12
  4. Step 4: Simplify right side
    1,128.13x = 1,388,558.02
  5. Step 5: Solve for x
    x = 1,388,558.02/1,128.13
  6. Step 6: Final answer
    x = 1,230.85

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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.