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Finding the Fourth Proportional to 3,321.20, 4,981.91 and 856.02

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Solution

The fourth proportional to 3,321.20, 4,981.91 and 856.02 is: 1,284.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,321.20 : 4,981.91 = 856.02 : x
  2. Step 2: Convert to fraction form
    3,321.20/4,981.91 = 856.02/x
  3. Step 3: Cross multiply
    3,321.20x = 4,981.91 × 856.02
  4. Step 4: Simplify right side
    3,321.20x = 4,264,600.98
  5. Step 5: Solve for x
    x = 4,264,600.98/3,321.20
  6. Step 6: Final answer
    x = 1,284.05

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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.