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Finding the Fourth Proportional to 986.06, 1,360.78 and 687.75

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Solution

The fourth proportional to 986.06, 1,360.78 and 687.75 is: 949.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.06 : 1,360.78 = 687.75 : x
  2. Step 2: Convert to fraction form
    986.06/1,360.78 = 687.75/x
  3. Step 3: Cross multiply
    986.06x = 1,360.78 × 687.75
  4. Step 4: Simplify right side
    986.06x = 935,869.62
  5. Step 5: Solve for x
    x = 935,869.62/986.06
  6. Step 6: Final answer
    x = 949.10

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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.