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Finding the Fourth Proportional to 856.37, 1,181.05 and 724.21

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Solution

The fourth proportional to 856.37, 1,181.05 and 724.21 is: 998.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.37 : 1,181.05 = 724.21 : x
  2. Step 2: Convert to fraction form
    856.37/1,181.05 = 724.21/x
  3. Step 3: Cross multiply
    856.37x = 1,181.05 × 724.21
  4. Step 4: Simplify right side
    856.37x = 855,323.46
  5. Step 5: Solve for x
    x = 855,323.46/856.37
  6. Step 6: Final answer
    x = 998.78

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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.