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Finding the Fourth Proportional to 986.26, 1,361.52 and 637.15

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Solution

The fourth proportional to 986.26, 1,361.52 and 637.15 is: 879.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.26 : 1,361.52 = 637.15 : x
  2. Step 2: Convert to fraction form
    986.26/1,361.52 = 637.15/x
  3. Step 3: Cross multiply
    986.26x = 1,361.52 × 637.15
  4. Step 4: Simplify right side
    986.26x = 867,492.47
  5. Step 5: Solve for x
    x = 867,492.47/986.26
  6. Step 6: Final answer
    x = 879.58

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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.