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Finding the Fourth Proportional to 1,099.67, 1,517.55 and 679.93

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Solution

The fourth proportional to 1,099.67, 1,517.55 and 679.93 is: 938.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.67 : 1,517.55 = 679.93 : x
  2. Step 2: Convert to fraction form
    1,099.67/1,517.55 = 679.93/x
  3. Step 3: Cross multiply
    1,099.67x = 1,517.55 × 679.93
  4. Step 4: Simplify right side
    1,099.67x = 1,031,827.77
  5. Step 5: Solve for x
    x = 1,031,827.77/1,099.67
  6. Step 6: Final answer
    x = 938.31

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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.