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Finding the Fourth Proportional to 20,900.72, 28,843.05 and 11,948.47

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Solution

The fourth proportional to 20,900.72, 28,843.05 and 11,948.47 is: 16,488.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,900.72 : 28,843.05 = 11,948.47 : x
  2. Step 2: Convert to fraction form
    20,900.72/28,843.05 = 11,948.47/x
  3. Step 3: Cross multiply
    20,900.72x = 28,843.05 × 11,948.47
  4. Step 4: Simplify right side
    20,900.72x = 344,630,317.63
  5. Step 5: Solve for x
    x = 344,630,317.63/20,900.72
  6. Step 6: Final answer
    x = 16,488.92

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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.