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Finding the Fourth Proportional to 20,967.86, 28,935.43 and 11,408.04

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Solution

The fourth proportional to 20,967.86, 28,935.43 and 11,408.04 is: 15,742.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,967.86 : 28,935.43 = 11,408.04 : x
  2. Step 2: Convert to fraction form
    20,967.86/28,935.43 = 11,408.04/x
  3. Step 3: Cross multiply
    20,967.86x = 28,935.43 × 11,408.04
  4. Step 4: Simplify right side
    20,967.86x = 330,096,514.34
  5. Step 5: Solve for x
    x = 330,096,514.34/20,967.86
  6. Step 6: Final answer
    x = 15,742.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.