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Finding the Fourth Proportional to 20,871.57, 28,807.01 and 19,190.31

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Solution

The fourth proportional to 20,871.57, 28,807.01 and 19,190.31 is: 26,486.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.57 : 28,807.01 = 19,190.31 : x
  2. Step 2: Convert to fraction form
    20,871.57/28,807.01 = 19,190.31/x
  3. Step 3: Cross multiply
    20,871.57x = 28,807.01 × 19,190.31
  4. Step 4: Simplify right side
    20,871.57x = 552,815,356.12
  5. Step 5: Solve for x
    x = 552,815,356.12/20,871.57
  6. Step 6: Final answer
    x = 26,486.52

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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.