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Finding the Fourth Proportional to 1,108.28, 1,661.12 and 712.45

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Solution

The fourth proportional to 1,108.28, 1,661.12 and 712.45 is: 1,067.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.28 : 1,661.12 = 712.45 : x
  2. Step 2: Convert to fraction form
    1,108.28/1,661.12 = 712.45/x
  3. Step 3: Cross multiply
    1,108.28x = 1,661.12 × 712.45
  4. Step 4: Simplify right side
    1,108.28x = 1,183,461.38
  5. Step 5: Solve for x
    x = 1,183,461.38/1,108.28
  6. Step 6: Final answer
    x = 1,067.84

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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.