Home / 20,734.80-31,102.20-18,985.20

Finding the Fourth Proportional to 20,734.80, 31,102.20 and 18,985.20

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Solution

The fourth proportional to 20,734.80, 31,102.20 and 18,985.20 is: 28,477.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,734.80 : 31,102.20 = 18,985.20 : x
  2. Step 2: Convert to fraction form
    20,734.80/31,102.20 = 18,985.20/x
  3. Step 3: Cross multiply
    20,734.80x = 31,102.20 × 18,985.20
  4. Step 4: Simplify right side
    20,734.80x = 590,481,487.44
  5. Step 5: Solve for x
    x = 590,481,487.44/20,734.80
  6. Step 6: Final answer
    x = 28,477.80

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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.