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Finding the Fourth Proportional to 5,318.42, 7,978.68 and 2,198.88

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Solution

The fourth proportional to 5,318.42, 7,978.68 and 2,198.88 is: 3,298.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,318.42 : 7,978.68 = 2,198.88 : x
  2. Step 2: Convert to fraction form
    5,318.42/7,978.68 = 2,198.88/x
  3. Step 3: Cross multiply
    5,318.42x = 7,978.68 × 2,198.88
  4. Step 4: Simplify right side
    5,318.42x = 17,544,159.88
  5. Step 5: Solve for x
    x = 17,544,159.88/5,318.42
  6. Step 6: Final answer
    x = 3,298.76

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1.5x scale

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.