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Finding the Fourth Proportional to 20,425, 28,185.96 and 11,473.48

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Solution

The fourth proportional to 20,425, 28,185.96 and 11,473.48 is: 15,833.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,425 : 28,185.96 = 11,473.48 : x
  2. Step 2: Convert to fraction form
    20,425/28,185.96 = 11,473.48/x
  3. Step 3: Cross multiply
    20,425x = 28,185.96 × 11,473.48
  4. Step 4: Simplify right side
    20,425x = 323,391,048.34
  5. Step 5: Solve for x
    x = 323,391,048.34/20,425
  6. Step 6: Final answer
    x = 15,833.10

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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.