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Finding the Fourth Proportional to 54,220.60, 81,330.90 and 20,942.20

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Solution

The fourth proportional to 54,220.60, 81,330.90 and 20,942.20 is: 31,413.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,220.60 : 81,330.90 = 20,942.20 : x
  2. Step 2: Convert to fraction form
    54,220.60/81,330.90 = 20,942.20/x
  3. Step 3: Cross multiply
    54,220.60x = 81,330.90 × 20,942.20
  4. Step 4: Simplify right side
    54,220.60x = 1,703,247,973.98
  5. Step 5: Solve for x
    x = 1,703,247,973.98/54,220.60
  6. Step 6: Final answer
    x = 31,413.30

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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.