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Finding the Fourth Proportional to 8,919.81, 12,309.45 and 4,941

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Solution

The fourth proportional to 8,919.81, 12,309.45 and 4,941 is: 6,818.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.81 : 12,309.45 = 4,941 : x
  2. Step 2: Convert to fraction form
    8,919.81/12,309.45 = 4,941/x
  3. Step 3: Cross multiply
    8,919.81x = 12,309.45 × 4,941
  4. Step 4: Simplify right side
    8,919.81x = 60,820,992.45
  5. Step 5: Solve for x
    x = 60,820,992.45/8,919.81
  6. Step 6: Final answer
    x = 6,818.64

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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.