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Finding the Fourth Proportional to 856.22, 1,181.72 and 660.20

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Solution

The fourth proportional to 856.22, 1,181.72 and 660.20 is: 911.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.22 : 1,181.72 = 660.20 : x
  2. Step 2: Convert to fraction form
    856.22/1,181.72 = 660.20/x
  3. Step 3: Cross multiply
    856.22x = 1,181.72 × 660.20
  4. Step 4: Simplify right side
    856.22x = 780,167.29
  5. Step 5: Solve for x
    x = 780,167.29/856.22
  6. Step 6: Final answer
    x = 911.18

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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.