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Finding the Fourth Proportional to 5,679.55, 8,516.90 and 1,980.69

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Solution

The fourth proportional to 5,679.55, 8,516.90 and 1,980.69 is: 2,970.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,679.55 : 8,516.90 = 1,980.69 : x
  2. Step 2: Convert to fraction form
    5,679.55/8,516.90 = 1,980.69/x
  3. Step 3: Cross multiply
    5,679.55x = 8,516.90 × 1,980.69
  4. Step 4: Simplify right side
    5,679.55x = 16,869,286.17
  5. Step 5: Solve for x
    x = 16,869,286.17/5,679.55
  6. Step 6: Final answer
    x = 2,970.18

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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.