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Finding the Fourth Proportional to 1,099.89, 1,518.39 and 747.66

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Solution

The fourth proportional to 1,099.89, 1,518.39 and 747.66 is: 1,032.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.89 : 1,518.39 = 747.66 : x
  2. Step 2: Convert to fraction form
    1,099.89/1,518.39 = 747.66/x
  3. Step 3: Cross multiply
    1,099.89x = 1,518.39 × 747.66
  4. Step 4: Simplify right side
    1,099.89x = 1,135,239.47
  5. Step 5: Solve for x
    x = 1,135,239.47/1,099.89
  6. Step 6: Final answer
    x = 1,032.14

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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.