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Finding the Fourth Proportional to 987.19, 1,361.71 and 791.17

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Solution

The fourth proportional to 987.19, 1,361.71 and 791.17 is: 1,091.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.19 : 1,361.71 = 791.17 : x
  2. Step 2: Convert to fraction form
    987.19/1,361.71 = 791.17/x
  3. Step 3: Cross multiply
    987.19x = 1,361.71 × 791.17
  4. Step 4: Simplify right side
    987.19x = 1,077,341.69
  5. Step 5: Solve for x
    x = 1,077,341.69/987.19
  6. Step 6: Final answer
    x = 1,091.32

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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.