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Finding the Fourth Proportional to 986.22, 1,362.18 and 738.64

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Solution

The fourth proportional to 986.22, 1,362.18 and 738.64 is: 1,020.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.22 : 1,362.18 = 738.64 : x
  2. Step 2: Convert to fraction form
    986.22/1,362.18 = 738.64/x
  3. Step 3: Cross multiply
    986.22x = 1,362.18 × 738.64
  4. Step 4: Simplify right side
    986.22x = 1,006,160.64
  5. Step 5: Solve for x
    x = 1,006,160.64/986.22
  6. Step 6: Final answer
    x = 1,020.22

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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.