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Finding the Fourth Proportional to 8,489.91, 11,712.44 and 5,130.78

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Solution

The fourth proportional to 8,489.91, 11,712.44 and 5,130.78 is: 7,078.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,489.91 : 11,712.44 = 5,130.78 : x
  2. Step 2: Convert to fraction form
    8,489.91/11,712.44 = 5,130.78/x
  3. Step 3: Cross multiply
    8,489.91x = 11,712.44 × 5,130.78
  4. Step 4: Simplify right side
    8,489.91x = 60,093,927.25
  5. Step 5: Solve for x
    x = 60,093,927.25/8,489.91
  6. Step 6: Final answer
    x = 7,078.28

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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.