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Finding the Fourth Proportional to 986.92, 1,361.95 and 776.70

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Solution

The fourth proportional to 986.92, 1,361.95 and 776.70 is: 1,071.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.92 : 1,361.95 = 776.70 : x
  2. Step 2: Convert to fraction form
    986.92/1,361.95 = 776.70/x
  3. Step 3: Cross multiply
    986.92x = 1,361.95 × 776.70
  4. Step 4: Simplify right side
    986.92x = 1,057,826.57
  5. Step 5: Solve for x
    x = 1,057,826.57/986.92
  6. Step 6: Final answer
    x = 1,071.85

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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.