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Finding the Fourth Proportional to 8,690.11, 11,992.20 and 4,913.21

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Solution

The fourth proportional to 8,690.11, 11,992.20 and 4,913.21 is: 6,780.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,690.11 : 11,992.20 = 4,913.21 : x
  2. Step 2: Convert to fraction form
    8,690.11/11,992.20 = 4,913.21/x
  3. Step 3: Cross multiply
    8,690.11x = 11,992.20 × 4,913.21
  4. Step 4: Simplify right side
    8,690.11x = 58,920,196.96
  5. Step 5: Solve for x
    x = 58,920,196.96/8,690.11
  6. Step 6: Final answer
    x = 6,780.14

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1.5x scale

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.