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Finding the Fourth Proportional to 21,989.44, 30,344.16 and 12,558.88

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Solution

The fourth proportional to 21,989.44, 30,344.16 and 12,558.88 is: 17,330.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,989.44 : 30,344.16 = 12,558.88 : x
  2. Step 2: Convert to fraction form
    21,989.44/30,344.16 = 12,558.88/x
  3. Step 3: Cross multiply
    21,989.44x = 30,344.16 × 12,558.88
  4. Step 4: Simplify right side
    21,989.44x = 381,088,664.14
  5. Step 5: Solve for x
    x = 381,088,664.14/21,989.44
  6. Step 6: Final answer
    x = 17,330.53

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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.