Home / 20,999.80-31,467.30-18,213.40

Finding the Fourth Proportional to 20,999.80, 31,467.30 and 18,213.40

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Solution

The fourth proportional to 20,999.80, 31,467.30 and 18,213.40 is: 27,292.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.80 : 31,467.30 = 18,213.40 : x
  2. Step 2: Convert to fraction form
    20,999.80/31,467.30 = 18,213.40/x
  3. Step 3: Cross multiply
    20,999.80x = 31,467.30 × 18,213.40
  4. Step 4: Simplify right side
    20,999.80x = 573,126,521.82
  5. Step 5: Solve for x
    x = 573,126,521.82/20,999.80
  6. Step 6: Final answer
    x = 27,292.00

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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.