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Finding the Fourth Proportional to 20,550, 28,359.03 and 11,118.57

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Solution

The fourth proportional to 20,550, 28,359.03 and 11,118.57 is: 15,343.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,550 : 28,359.03 = 11,118.57 : x
  2. Step 2: Convert to fraction form
    20,550/28,359.03 = 11,118.57/x
  3. Step 3: Cross multiply
    20,550x = 28,359.03 × 11,118.57
  4. Step 4: Simplify right side
    20,550x = 315,311,860.19
  5. Step 5: Solve for x
    x = 315,311,860.19/20,550
  6. Step 6: Final answer
    x = 15,343.64

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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.