Home / 20,675.20-31,012.80-18,212.80

Finding the Fourth Proportional to 20,675.20, 31,012.80 and 18,212.80

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Solution

The fourth proportional to 20,675.20, 31,012.80 and 18,212.80 is: 27,319.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,675.20 : 31,012.80 = 18,212.80 : x
  2. Step 2: Convert to fraction form
    20,675.20/31,012.80 = 18,212.80/x
  3. Step 3: Cross multiply
    20,675.20x = 31,012.80 × 18,212.80
  4. Step 4: Simplify right side
    20,675.20x = 564,829,923.84
  5. Step 5: Solve for x
    x = 564,829,923.84/20,675.20
  6. Step 6: Final answer
    x = 27,319.20

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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.