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Finding the Fourth Proportional to 20,287.86, 28,119.96 and 19,119.86

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Solution

The fourth proportional to 20,287.86, 28,119.96 and 19,119.86 is: 26,501.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,287.86 : 28,119.96 = 19,119.86 : x
  2. Step 2: Convert to fraction form
    20,287.86/28,119.96 = 19,119.86/x
  3. Step 3: Cross multiply
    20,287.86x = 28,119.96 × 19,119.86
  4. Step 4: Simplify right side
    20,287.86x = 537,649,462.21
  5. Step 5: Solve for x
    x = 537,649,462.21/20,287.86
  6. Step 6: Final answer
    x = 26,501.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.