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Finding the Fourth Proportional to 9,981.68, 13,780.64 and 8,874.60

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Solution

The fourth proportional to 9,981.68, 13,780.64 and 8,874.60 is: 12,252.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,981.68 : 13,780.64 = 8,874.60 : x
  2. Step 2: Convert to fraction form
    9,981.68/13,780.64 = 8,874.60/x
  3. Step 3: Cross multiply
    9,981.68x = 13,780.64 × 8,874.60
  4. Step 4: Simplify right side
    9,981.68x = 122,297,667.74
  5. Step 5: Solve for x
    x = 122,297,667.74/9,981.68
  6. Step 6: Final answer
    x = 12,252.21

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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.