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Finding the Fourth Proportional to 21,996.40, 32,994.60 and 12,665.20

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Solution

The fourth proportional to 21,996.40, 32,994.60 and 12,665.20 is: 18,997.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,996.40 : 32,994.60 = 12,665.20 : x
  2. Step 2: Convert to fraction form
    21,996.40/32,994.60 = 12,665.20/x
  3. Step 3: Cross multiply
    21,996.40x = 32,994.60 × 12,665.20
  4. Step 4: Simplify right side
    21,996.40x = 417,883,207.92
  5. Step 5: Solve for x
    x = 417,883,207.92/21,996.40
  6. Step 6: Final answer
    x = 18,997.80

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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.