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Finding the Fourth Proportional to 12,680.64, 18,981.05 and 8,708.63

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Solution

The fourth proportional to 12,680.64, 18,981.05 and 8,708.63 is: 13,035.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,680.64 : 18,981.05 = 8,708.63 : x
  2. Step 2: Convert to fraction form
    12,680.64/18,981.05 = 8,708.63/x
  3. Step 3: Cross multiply
    12,680.64x = 18,981.05 × 8,708.63
  4. Step 4: Simplify right side
    12,680.64x = 165,298,803.01
  5. Step 5: Solve for x
    x = 165,298,803.01/12,680.64
  6. Step 6: Final answer
    x = 13,035.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.