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Finding the Fourth Proportional to 986.62, 1,360.11 and 690.97

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Solution

The fourth proportional to 986.62, 1,360.11 and 690.97 is: 952.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.62 : 1,360.11 = 690.97 : x
  2. Step 2: Convert to fraction form
    986.62/1,360.11 = 690.97/x
  3. Step 3: Cross multiply
    986.62x = 1,360.11 × 690.97
  4. Step 4: Simplify right side
    986.62x = 939,795.21
  5. Step 5: Solve for x
    x = 939,795.21/986.62
  6. Step 6: Final answer
    x = 952.54

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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.