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Finding the Fourth Proportional to 21,805.90, 32,659.90 and 18,958.12

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Solution

The fourth proportional to 21,805.90, 32,659.90 and 18,958.12 is: 28,394.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,805.90 : 32,659.90 = 18,958.12 : x
  2. Step 2: Convert to fraction form
    21,805.90/32,659.90 = 18,958.12/x
  3. Step 3: Cross multiply
    21,805.90x = 32,659.90 × 18,958.12
  4. Step 4: Simplify right side
    21,805.90x = 619,170,303.39
  5. Step 5: Solve for x
    x = 619,170,303.39/21,805.90
  6. Step 6: Final answer
    x = 28,394.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.