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Finding the Fourth Proportional to 8,920.13, 13,447.27 and 8,318.09

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Solution

The fourth proportional to 8,920.13, 13,447.27 and 8,318.09 is: 12,539.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.13 : 13,447.27 = 8,318.09 : x
  2. Step 2: Convert to fraction form
    8,920.13/13,447.27 = 8,318.09/x
  3. Step 3: Cross multiply
    8,920.13x = 13,447.27 × 8,318.09
  4. Step 4: Simplify right side
    8,920.13x = 111,855,599.34
  5. Step 5: Solve for x
    x = 111,855,599.34/8,920.13
  6. Step 6: Final answer
    x = 12,539.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.