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Finding the Fourth Proportional to 8,588.78, 12,878.75 and 5,079.86

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Solution

The fourth proportional to 8,588.78, 12,878.75 and 5,079.86 is: 7,617.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,588.78 : 12,878.75 = 5,079.86 : x
  2. Step 2: Convert to fraction form
    8,588.78/12,878.75 = 5,079.86/x
  3. Step 3: Cross multiply
    8,588.78x = 12,878.75 × 5,079.86
  4. Step 4: Simplify right side
    8,588.78x = 65,422,246.98
  5. Step 5: Solve for x
    x = 65,422,246.98/8,588.78
  6. Step 6: Final answer
    x = 7,617.18

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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.