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Finding the Fourth Proportional to 5,271.78, 7,909.11 and 2,149.86

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Solution

The fourth proportional to 5,271.78, 7,909.11 and 2,149.86 is: 3,225.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,271.78 : 7,909.11 = 2,149.86 : x
  2. Step 2: Convert to fraction form
    5,271.78/7,909.11 = 2,149.86/x
  3. Step 3: Cross multiply
    5,271.78x = 7,909.11 × 2,149.86
  4. Step 4: Simplify right side
    5,271.78x = 17,003,479.22
  5. Step 5: Solve for x
    x = 17,003,479.22/5,271.78
  6. Step 6: Final answer
    x = 3,225.38

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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.