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Finding the Fourth Proportional to 20,157.89, 27,798.81 and 15,369.42

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Solution

The fourth proportional to 20,157.89, 27,798.81 and 15,369.42 is: 21,195.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,157.89 : 27,798.81 = 15,369.42 : x
  2. Step 2: Convert to fraction form
    20,157.89/27,798.81 = 15,369.42/x
  3. Step 3: Cross multiply
    20,157.89x = 27,798.81 × 15,369.42
  4. Step 4: Simplify right side
    20,157.89x = 427,251,586.39
  5. Step 5: Solve for x
    x = 427,251,586.39/20,157.89
  6. Step 6: Final answer
    x = 21,195.25

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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.