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Finding the Fourth Proportional to 19,921.20, 29,881.80 and 8,816.10

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Solution

The fourth proportional to 19,921.20, 29,881.80 and 8,816.10 is: 13,224.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,921.20 : 29,881.80 = 8,816.10 : x
  2. Step 2: Convert to fraction form
    19,921.20/29,881.80 = 8,816.10/x
  3. Step 3: Cross multiply
    19,921.20x = 29,881.80 × 8,816.10
  4. Step 4: Simplify right side
    19,921.20x = 263,440,936.98
  5. Step 5: Solve for x
    x = 263,440,936.98/19,921.20
  6. Step 6: Final answer
    x = 13,224.15

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1.5x scale

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.