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Finding the Fourth Proportional to 20,871.70, 28,807.29 and 19,190.43

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Solution

The fourth proportional to 20,871.70, 28,807.29 and 19,190.43 is: 26,486.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.70 : 28,807.29 = 19,190.43 : x
  2. Step 2: Convert to fraction form
    20,871.70/28,807.29 = 19,190.43/x
  3. Step 3: Cross multiply
    20,871.70x = 28,807.29 × 19,190.43
  4. Step 4: Simplify right side
    20,871.70x = 552,824,282.23
  5. Step 5: Solve for x
    x = 552,824,282.23/20,871.70
  6. Step 6: Final answer
    x = 26,486.79

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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.