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Finding the Fourth Proportional to 8,898.21, 12,278.43 and 4,919.40

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Solution

The fourth proportional to 8,898.21, 12,278.43 and 4,919.40 is: 6,788.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,898.21 : 12,278.43 = 4,919.40 : x
  2. Step 2: Convert to fraction form
    8,898.21/12,278.43 = 4,919.40/x
  3. Step 3: Cross multiply
    8,898.21x = 12,278.43 × 4,919.40
  4. Step 4: Simplify right side
    8,898.21x = 60,402,508.54
  5. Step 5: Solve for x
    x = 60,402,508.54/8,898.21
  6. Step 6: Final answer
    x = 6,788.16

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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.