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Finding the Fourth Proportional to 20,666.80, 31,000.20 and 18,593.20

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Solution

The fourth proportional to 20,666.80, 31,000.20 and 18,593.20 is: 27,889.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,666.80 : 31,000.20 = 18,593.20 : x
  2. Step 2: Convert to fraction form
    20,666.80/31,000.20 = 18,593.20/x
  3. Step 3: Cross multiply
    20,666.80x = 31,000.20 × 18,593.20
  4. Step 4: Simplify right side
    20,666.80x = 576,392,918.64
  5. Step 5: Solve for x
    x = 576,392,918.64/20,666.80
  6. Step 6: Final answer
    x = 27,889.80

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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.