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Finding the Fourth Proportional to 20,456.80, 30,685.20 and 20,111.20

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Solution

The fourth proportional to 20,456.80, 30,685.20 and 20,111.20 is: 30,166.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,456.80 : 30,685.20 = 20,111.20 : x
  2. Step 2: Convert to fraction form
    20,456.80/30,685.20 = 20,111.20/x
  3. Step 3: Cross multiply
    20,456.80x = 30,685.20 × 20,111.20
  4. Step 4: Simplify right side
    20,456.80x = 617,116,194.24
  5. Step 5: Solve for x
    x = 617,116,194.24/20,456.80
  6. Step 6: Final answer
    x = 30,166.80

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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.