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Finding the Fourth Proportional to 8,919.10, 13,380.95 and 2,678.86

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Solution

The fourth proportional to 8,919.10, 13,380.95 and 2,678.86 is: 4,018.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.10 : 13,380.95 = 2,678.86 : x
  2. Step 2: Convert to fraction form
    8,919.10/13,380.95 = 2,678.86/x
  3. Step 3: Cross multiply
    8,919.10x = 13,380.95 × 2,678.86
  4. Step 4: Simplify right side
    8,919.10x = 35,845,691.72
  5. Step 5: Solve for x
    x = 35,845,691.72/8,919.10
  6. Step 6: Final answer
    x = 4,018.98

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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.