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Finding the Fourth Proportional to 72,719.07, 109,080.47 and 20,129.01

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Solution

The fourth proportional to 72,719.07, 109,080.47 and 20,129.01 is: 30,194.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,719.07 : 109,080.47 = 20,129.01 : x
  2. Step 2: Convert to fraction form
    72,719.07/109,080.47 = 20,129.01/x
  3. Step 3: Cross multiply
    72,719.07x = 109,080.47 × 20,129.01
  4. Step 4: Simplify right side
    72,719.07x = 2,195,681,512.71
  5. Step 5: Solve for x
    x = 2,195,681,512.71/72,719.07
  6. Step 6: Final answer
    x = 30,194.03

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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.