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Finding the Fourth Proportional to 986.85, 1,361.32 and 706.50

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Solution

The fourth proportional to 986.85, 1,361.32 and 706.50 is: 974.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.85 : 1,361.32 = 706.50 : x
  2. Step 2: Convert to fraction form
    986.85/1,361.32 = 706.50/x
  3. Step 3: Cross multiply
    986.85x = 1,361.32 × 706.50
  4. Step 4: Simplify right side
    986.85x = 961,770.81
  5. Step 5: Solve for x
    x = 961,770.81/986.85
  6. Step 6: Final answer
    x = 974.59

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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.