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Finding the Fourth Proportional to 986.34, 1,362.51 and 855.12

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Solution

The fourth proportional to 986.34, 1,362.51 and 855.12 is: 1,181.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.34 : 1,362.51 = 855.12 : x
  2. Step 2: Convert to fraction form
    986.34/1,362.51 = 855.12/x
  3. Step 3: Cross multiply
    986.34x = 1,362.51 × 855.12
  4. Step 4: Simplify right side
    986.34x = 1,165,109.55
  5. Step 5: Solve for x
    x = 1,165,109.55/986.34
  6. Step 6: Final answer
    x = 1,181.25

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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.