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Finding the Fourth Proportional to 8,539.71, 11,781.09 and 5,181.86

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Solution

The fourth proportional to 8,539.71, 11,781.09 and 5,181.86 is: 7,148.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,539.71 : 11,781.09 = 5,181.86 : x
  2. Step 2: Convert to fraction form
    8,539.71/11,781.09 = 5,181.86/x
  3. Step 3: Cross multiply
    8,539.71x = 11,781.09 × 5,181.86
  4. Step 4: Simplify right side
    8,539.71x = 61,047,900.12
  5. Step 5: Solve for x
    x = 61,047,900.12/8,539.71
  6. Step 6: Final answer
    x = 7,148.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.