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Finding the Fourth Proportional to 20,398.74, 30,598.37 and 7,919.47

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Solution

The fourth proportional to 20,398.74, 30,598.37 and 7,919.47 is: 11,879.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,398.74 : 30,598.37 = 7,919.47 : x
  2. Step 2: Convert to fraction form
    20,398.74/30,598.37 = 7,919.47/x
  3. Step 3: Cross multiply
    20,398.74x = 30,598.37 × 7,919.47
  4. Step 4: Simplify right side
    20,398.74x = 242,322,873.26
  5. Step 5: Solve for x
    x = 242,322,873.26/20,398.74
  6. Step 6: Final answer
    x = 11,879.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.