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Finding the Fourth Proportional to 1,122.88, 1,687.92 and 1,065.28

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Solution

The fourth proportional to 1,122.88, 1,687.92 and 1,065.28 is: 1,601.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.88 : 1,687.92 = 1,065.28 : x
  2. Step 2: Convert to fraction form
    1,122.88/1,687.92 = 1,065.28/x
  3. Step 3: Cross multiply
    1,122.88x = 1,687.92 × 1,065.28
  4. Step 4: Simplify right side
    1,122.88x = 1,798,107.42
  5. Step 5: Solve for x
    x = 1,798,107.42/1,122.88
  6. Step 6: Final answer
    x = 1,601.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.