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Finding the Fourth Proportional to 20,645.80, 28,490.22 and 11,693.08

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Solution

The fourth proportional to 20,645.80, 28,490.22 and 11,693.08 is: 16,135.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,645.80 : 28,490.22 = 11,693.08 : x
  2. Step 2: Convert to fraction form
    20,645.80/28,490.22 = 11,693.08/x
  3. Step 3: Cross multiply
    20,645.80x = 28,490.22 × 11,693.08
  4. Step 4: Simplify right side
    20,645.80x = 333,138,421.68
  5. Step 5: Solve for x
    x = 333,138,421.68/20,645.80
  6. Step 6: Final answer
    x = 16,135.89

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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.