Home / 30,989.55-42,769.20-18,414.30

Finding the Fourth Proportional to 30,989.55, 42,769.20 and 18,414.30

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Solution

The fourth proportional to 30,989.55, 42,769.20 and 18,414.30 is: 25,413.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,989.55 : 42,769.20 = 18,414.30 : x
  2. Step 2: Convert to fraction form
    30,989.55/42,769.20 = 18,414.30/x
  3. Step 3: Cross multiply
    30,989.55x = 42,769.20 × 18,414.30
  4. Step 4: Simplify right side
    30,989.55x = 787,564,879.56
  5. Step 5: Solve for x
    x = 787,564,879.56/30,989.55
  6. Step 6: Final answer
    x = 25,413.89

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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.