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Finding the Fourth Proportional to 987.18, 1,361.61 and 655.44

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Solution

The fourth proportional to 987.18, 1,361.61 and 655.44 is: 904.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.18 : 1,361.61 = 655.44 : x
  2. Step 2: Convert to fraction form
    987.18/1,361.61 = 655.44/x
  3. Step 3: Cross multiply
    987.18x = 1,361.61 × 655.44
  4. Step 4: Simplify right side
    987.18x = 892,453.66
  5. Step 5: Solve for x
    x = 892,453.66/987.18
  6. Step 6: Final answer
    x = 904.04

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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.