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Finding the Fourth Proportional to 30,980.73, 42,753.60 and 18,234.39

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Solution

The fourth proportional to 30,980.73, 42,753.60 and 18,234.39 is: 25,163.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,980.73 : 42,753.60 = 18,234.39 : x
  2. Step 2: Convert to fraction form
    30,980.73/42,753.60 = 18,234.39/x
  3. Step 3: Cross multiply
    30,980.73x = 42,753.60 × 18,234.39
  4. Step 4: Simplify right side
    30,980.73x = 779,585,816.30
  5. Step 5: Solve for x
    x = 779,585,816.30/30,980.73
  6. Step 6: Final answer
    x = 25,163.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.