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Finding the Fourth Proportional to 8,607.85, 12,919.87 and 4,228.45

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Solution

The fourth proportional to 8,607.85, 12,919.87 and 4,228.45 is: 6,346.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,607.85 : 12,919.87 = 4,228.45 : x
  2. Step 2: Convert to fraction form
    8,607.85/12,919.87 = 4,228.45/x
  3. Step 3: Cross multiply
    8,607.85x = 12,919.87 × 4,228.45
  4. Step 4: Simplify right side
    8,607.85x = 54,630,997.29
  5. Step 5: Solve for x
    x = 54,630,997.29/8,607.85
  6. Step 6: Final answer
    x = 6,346.65

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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.