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Finding the Fourth Proportional to 20,572.94, 30,859.50 and 4,990.56

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Solution

The fourth proportional to 20,572.94, 30,859.50 and 4,990.56 is: 7,485.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,572.94 : 30,859.50 = 4,990.56 : x
  2. Step 2: Convert to fraction form
    20,572.94/30,859.50 = 4,990.56/x
  3. Step 3: Cross multiply
    20,572.94x = 30,859.50 × 4,990.56
  4. Step 4: Simplify right side
    20,572.94x = 154,006,186.32
  5. Step 5: Solve for x
    x = 154,006,186.32/20,572.94
  6. Step 6: Final answer
    x = 7,485.86

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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.