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Finding the Fourth Proportional to 1,099.82, 1,648.65 and 611.87

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Solution

The fourth proportional to 1,099.82, 1,648.65 and 611.87 is: 917.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.82 : 1,648.65 = 611.87 : x
  2. Step 2: Convert to fraction form
    1,099.82/1,648.65 = 611.87/x
  3. Step 3: Cross multiply
    1,099.82x = 1,648.65 × 611.87
  4. Step 4: Simplify right side
    1,099.82x = 1,008,759.48
  5. Step 5: Solve for x
    x = 1,008,759.48/1,099.82
  6. Step 6: Final answer
    x = 917.20

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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.