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Finding the Fourth Proportional to 3,321.18, 4,981.89 and 856.08

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Solution

The fourth proportional to 3,321.18, 4,981.89 and 856.08 is: 1,284.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,321.18 : 4,981.89 = 856.08 : x
  2. Step 2: Convert to fraction form
    3,321.18/4,981.89 = 856.08/x
  3. Step 3: Cross multiply
    3,321.18x = 4,981.89 × 856.08
  4. Step 4: Simplify right side
    3,321.18x = 4,264,896.39
  5. Step 5: Solve for x
    x = 4,264,896.39/3,321.18
  6. Step 6: Final answer
    x = 1,284.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.