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Finding the Fourth Proportional to 18,991.83, 25,980.93 and 18,911.88

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Solution

The fourth proportional to 18,991.83, 25,980.93 and 18,911.88 is: 25,871.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.83 : 25,980.93 = 18,911.88 : x
  2. Step 2: Convert to fraction form
    18,991.83/25,980.93 = 18,911.88/x
  3. Step 3: Cross multiply
    18,991.83x = 25,980.93 × 18,911.88
  4. Step 4: Simplify right side
    18,991.83x = 491,348,230.45
  5. Step 5: Solve for x
    x = 491,348,230.45/18,991.83
  6. Step 6: Final answer
    x = 25,871.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.