Home / 21,074.80-31,612.20-20,102.80

Finding the Fourth Proportional to 21,074.80, 31,612.20 and 20,102.80

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Solution

The fourth proportional to 21,074.80, 31,612.20 and 20,102.80 is: 30,154.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,074.80 : 31,612.20 = 20,102.80 : x
  2. Step 2: Convert to fraction form
    21,074.80/31,612.20 = 20,102.80/x
  3. Step 3: Cross multiply
    21,074.80x = 31,612.20 × 20,102.80
  4. Step 4: Simplify right side
    21,074.80x = 635,493,734.16
  5. Step 5: Solve for x
    x = 635,493,734.16/21,074.80
  6. Step 6: Final answer
    x = 30,154.20

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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.