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Finding the Fourth Proportional to 1,118.48, 1,676.48 and 728.75

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Solution

The fourth proportional to 1,118.48, 1,676.48 and 728.75 is: 1,092.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.48 : 1,676.48 = 728.75 : x
  2. Step 2: Convert to fraction form
    1,118.48/1,676.48 = 728.75/x
  3. Step 3: Cross multiply
    1,118.48x = 1,676.48 × 728.75
  4. Step 4: Simplify right side
    1,118.48x = 1,221,735.35
  5. Step 5: Solve for x
    x = 1,221,735.35/1,118.48
  6. Step 6: Final answer
    x = 1,092.32

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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.