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Finding the Fourth Proportional to 20,645.69, 30,690.14 and 20,039.55

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Solution

The fourth proportional to 20,645.69, 30,690.14 and 20,039.55 is: 29,789.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,645.69 : 30,690.14 = 20,039.55 : x
  2. Step 2: Convert to fraction form
    20,645.69/30,690.14 = 20,039.55/x
  3. Step 3: Cross multiply
    20,645.69x = 30,690.14 × 20,039.55
  4. Step 4: Simplify right side
    20,645.69x = 615,016,665.11
  5. Step 5: Solve for x
    x = 615,016,665.11/20,645.69
  6. Step 6: Final answer
    x = 29,789.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.