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Finding the Fourth Proportional to 20,791.89, 28,695.74 and 13,235.81

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Solution

The fourth proportional to 20,791.89, 28,695.74 and 13,235.81 is: 18,267.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,791.89 : 28,695.74 = 13,235.81 : x
  2. Step 2: Convert to fraction form
    20,791.89/28,695.74 = 13,235.81/x
  3. Step 3: Cross multiply
    20,791.89x = 28,695.74 × 13,235.81
  4. Step 4: Simplify right side
    20,791.89x = 379,811,152.79
  5. Step 5: Solve for x
    x = 379,811,152.79/20,791.89
  6. Step 6: Final answer
    x = 18,267.27

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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.