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Finding the Fourth Proportional to 20,188.80, 30,285.90 and 7,045.20

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Solution

The fourth proportional to 20,188.80, 30,285.90 and 7,045.20 is: 10,568.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,188.80 : 30,285.90 = 7,045.20 : x
  2. Step 2: Convert to fraction form
    20,188.80/30,285.90 = 7,045.20/x
  3. Step 3: Cross multiply
    20,188.80x = 30,285.90 × 7,045.20
  4. Step 4: Simplify right side
    20,188.80x = 213,370,222.68
  5. Step 5: Solve for x
    x = 213,370,222.68/20,188.80
  6. Step 6: Final answer
    x = 10,568.74

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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.