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Finding the Fourth Proportional to 72,942.39, 109,414.80 and 20,350.98

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Solution

The fourth proportional to 72,942.39, 109,414.80 and 20,350.98 is: 30,526.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,942.39 : 109,414.80 = 20,350.98 : x
  2. Step 2: Convert to fraction form
    72,942.39/109,414.80 = 20,350.98/x
  3. Step 3: Cross multiply
    72,942.39x = 109,414.80 × 20,350.98
  4. Step 4: Simplify right side
    72,942.39x = 2,226,698,406.50
  5. Step 5: Solve for x
    x = 2,226,698,406.50/72,942.39
  6. Step 6: Final answer
    x = 30,526.81

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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.