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Finding the Fourth Proportional to 20,565.74, 30,860.90 and 18,892.68

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Solution

The fourth proportional to 20,565.74, 30,860.90 and 18,892.68 is: 28,350.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,565.74 : 30,860.90 = 18,892.68 : x
  2. Step 2: Convert to fraction form
    20,565.74/30,860.90 = 18,892.68/x
  3. Step 3: Cross multiply
    20,565.74x = 30,860.90 × 18,892.68
  4. Step 4: Simplify right side
    20,565.74x = 583,045,129.48
  5. Step 5: Solve for x
    x = 583,045,129.48/20,565.74
  6. Step 6: Final answer
    x = 28,350.31

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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.