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Finding the Fourth Proportional to 987.66, 1,361.68 and 809.97

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Solution

The fourth proportional to 987.66, 1,361.68 and 809.97 is: 1,116.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.66 : 1,361.68 = 809.97 : x
  2. Step 2: Convert to fraction form
    987.66/1,361.68 = 809.97/x
  3. Step 3: Cross multiply
    987.66x = 1,361.68 × 809.97
  4. Step 4: Simplify right side
    987.66x = 1,102,919.95
  5. Step 5: Solve for x
    x = 1,102,919.95/987.66
  6. Step 6: Final answer
    x = 1,116.70

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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.