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Finding the Fourth Proportional to 20,287.70, 30,431.55 and 11,539.70

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Solution

The fourth proportional to 20,287.70, 30,431.55 and 11,539.70 is: 17,309.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,287.70 : 30,431.55 = 11,539.70 : x
  2. Step 2: Convert to fraction form
    20,287.70/30,431.55 = 11,539.70/x
  3. Step 3: Cross multiply
    20,287.70x = 30,431.55 × 11,539.70
  4. Step 4: Simplify right side
    20,287.70x = 351,170,957.54
  5. Step 5: Solve for x
    x = 351,170,957.54/20,287.70
  6. Step 6: Final answer
    x = 17,309.55

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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.