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Finding the Fourth Proportional to 1,171.67, 1,615.75 and 987.09

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Solution

The fourth proportional to 1,171.67, 1,615.75 and 987.09 is: 1,361.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.67 : 1,615.75 = 987.09 : x
  2. Step 2: Convert to fraction form
    1,171.67/1,615.75 = 987.09/x
  3. Step 3: Cross multiply
    1,171.67x = 1,615.75 × 987.09
  4. Step 4: Simplify right side
    1,171.67x = 1,594,882.14
  5. Step 5: Solve for x
    x = 1,594,882.14/1,171.67
  6. Step 6: Final answer
    x = 1,361.21

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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.