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Finding the Fourth Proportional to 19,990.80, 27,583.20 and 12,031.20

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Solution

The fourth proportional to 19,990.80, 27,583.20 and 12,031.20 is: 16,600.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,990.80 : 27,583.20 = 12,031.20 : x
  2. Step 2: Convert to fraction form
    19,990.80/27,583.20 = 12,031.20/x
  3. Step 3: Cross multiply
    19,990.80x = 27,583.20 × 12,031.20
  4. Step 4: Simplify right side
    19,990.80x = 331,858,995.84
  5. Step 5: Solve for x
    x = 331,858,995.84/19,990.80
  6. Step 6: Final answer
    x = 16,600.59

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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.