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Finding the Fourth Proportional to 987.22, 1,361.00 and 717.77

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Solution

The fourth proportional to 987.22, 1,361.00 and 717.77 is: 989.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.22 : 1,361.00 = 717.77 : x
  2. Step 2: Convert to fraction form
    987.22/1,361.00 = 717.77/x
  3. Step 3: Cross multiply
    987.22x = 1,361.00 × 717.77
  4. Step 4: Simplify right side
    987.22x = 976,890.17
  5. Step 5: Solve for x
    x = 976,890.17/987.22
  6. Step 6: Final answer
    x = 989.54

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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.