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Finding the Fourth Proportional to 20,666.63, 28,520.15 and 11,235.39

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Solution

The fourth proportional to 20,666.63, 28,520.15 and 11,235.39 is: 15,504.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,666.63 : 28,520.15 = 11,235.39 : x
  2. Step 2: Convert to fraction form
    20,666.63/28,520.15 = 11,235.39/x
  3. Step 3: Cross multiply
    20,666.63x = 28,520.15 × 11,235.39
  4. Step 4: Simplify right side
    20,666.63x = 320,434,951.93
  5. Step 5: Solve for x
    x = 320,434,951.93/20,666.63
  6. Step 6: Final answer
    x = 15,504.95

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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.