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Finding the Fourth Proportional to 73,136.80, 109,705.20 and 20,555.20

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Solution

The fourth proportional to 73,136.80, 109,705.20 and 20,555.20 is: 30,832.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,136.80 : 109,705.20 = 20,555.20 : x
  2. Step 2: Convert to fraction form
    73,136.80/109,705.20 = 20,555.20/x
  3. Step 3: Cross multiply
    73,136.80x = 109,705.20 × 20,555.20
  4. Step 4: Simplify right side
    73,136.80x = 2,255,012,327.04
  5. Step 5: Solve for x
    x = 2,255,012,327.04/73,136.80
  6. Step 6: Final answer
    x = 30,832.80

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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.