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Finding the Fourth Proportional to 1,108.90, 1,530.26 and 611.54

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Solution

The fourth proportional to 1,108.90, 1,530.26 and 611.54 is: 843.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.90 : 1,530.26 = 611.54 : x
  2. Step 2: Convert to fraction form
    1,108.90/1,530.26 = 611.54/x
  3. Step 3: Cross multiply
    1,108.90x = 1,530.26 × 611.54
  4. Step 4: Simplify right side
    1,108.90x = 935,815.20
  5. Step 5: Solve for x
    x = 935,815.20/1,108.90
  6. Step 6: Final answer
    x = 843.91

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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.