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Finding the Fourth Proportional to 986.49, 1,361.11 and 587.90

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Solution

The fourth proportional to 986.49, 1,361.11 and 587.90 is: 811.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.49 : 1,361.11 = 587.90 : x
  2. Step 2: Convert to fraction form
    986.49/1,361.11 = 587.90/x
  3. Step 3: Cross multiply
    986.49x = 1,361.11 × 587.90
  4. Step 4: Simplify right side
    986.49x = 800,186.82
  5. Step 5: Solve for x
    x = 800,186.82/986.49
  6. Step 6: Final answer
    x = 811.15

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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.