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Finding the Fourth Proportional to 72,697.32, 109,037.88 and 20,100

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Solution

The fourth proportional to 72,697.32, 109,037.88 and 20,100 is: 30,147.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,697.32 : 109,037.88 = 20,100 : x
  2. Step 2: Convert to fraction form
    72,697.32/109,037.88 = 20,100/x
  3. Step 3: Cross multiply
    72,697.32x = 109,037.88 × 20,100
  4. Step 4: Simplify right side
    72,697.32x = 2,191,661,388
  5. Step 5: Solve for x
    x = 2,191,661,388/72,697.32
  6. Step 6: Final answer
    x = 30,147.76

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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.