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Finding the Fourth Proportional to 987.22, 1,361.19 and 655.12

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Solution

The fourth proportional to 987.22, 1,361.19 and 655.12 is: 903.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.22 : 1,361.19 = 655.12 : x
  2. Step 2: Convert to fraction form
    987.22/1,361.19 = 655.12/x
  3. Step 3: Cross multiply
    987.22x = 1,361.19 × 655.12
  4. Step 4: Simplify right side
    987.22x = 891,742.79
  5. Step 5: Solve for x
    x = 891,742.79/987.22
  6. Step 6: Final answer
    x = 903.29

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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.