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Finding the Fourth Proportional to 20,567.88, 30,864.10 and 18,894.80

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Solution

The fourth proportional to 20,567.88, 30,864.10 and 18,894.80 is: 28,353.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,567.88 : 30,864.10 = 18,894.80 : x
  2. Step 2: Convert to fraction form
    20,567.88/30,864.10 = 18,894.80/x
  3. Step 3: Cross multiply
    20,567.88x = 30,864.10 × 18,894.80
  4. Step 4: Simplify right side
    20,567.88x = 583,170,996.68
  5. Step 5: Solve for x
    x = 583,170,996.68/20,567.88
  6. Step 6: Final answer
    x = 28,353.48

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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.