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Finding the Fourth Proportional to 72,720.66, 109,080.99 and 20,130.12

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Solution

The fourth proportional to 72,720.66, 109,080.99 and 20,130.12 is: 30,195.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,720.66 : 109,080.99 = 20,130.12 : x
  2. Step 2: Convert to fraction form
    72,720.66/109,080.99 = 20,130.12/x
  3. Step 3: Cross multiply
    72,720.66x = 109,080.99 × 20,130.12
  4. Step 4: Simplify right side
    72,720.66x = 2,195,813,418.42
  5. Step 5: Solve for x
    x = 2,195,813,418.42/72,720.66
  6. Step 6: Final answer
    x = 30,195.18

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Similar ratio
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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.