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Finding the Fourth Proportional to 986.45, 1,361.60 and 637.13

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Solution

The fourth proportional to 986.45, 1,361.60 and 637.13 is: 879.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.45 : 1,361.60 = 637.13 : x
  2. Step 2: Convert to fraction form
    986.45/1,361.60 = 637.13/x
  3. Step 3: Cross multiply
    986.45x = 1,361.60 × 637.13
  4. Step 4: Simplify right side
    986.45x = 867,506.21
  5. Step 5: Solve for x
    x = 867,506.21/986.45
  6. Step 6: Final answer
    x = 879.43

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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.