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Finding the Fourth Proportional to 986.82, 1,359.44 and 675.78

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Solution

The fourth proportional to 986.82, 1,359.44 and 675.78 is: 930.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.82 : 1,359.44 = 675.78 : x
  2. Step 2: Convert to fraction form
    986.82/1,359.44 = 675.78/x
  3. Step 3: Cross multiply
    986.82x = 1,359.44 × 675.78
  4. Step 4: Simplify right side
    986.82x = 918,682.36
  5. Step 5: Solve for x
    x = 918,682.36/986.82
  6. Step 6: Final answer
    x = 930.95

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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.