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Finding the Fourth Proportional to 20,418.94, 30,629.22 and 6,388.39

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Solution

The fourth proportional to 20,418.94, 30,629.22 and 6,388.39 is: 9,582.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,418.94 : 30,629.22 = 6,388.39 : x
  2. Step 2: Convert to fraction form
    20,418.94/30,629.22 = 6,388.39/x
  3. Step 3: Cross multiply
    20,418.94x = 30,629.22 × 6,388.39
  4. Step 4: Simplify right side
    20,418.94x = 195,671,402.76
  5. Step 5: Solve for x
    x = 195,671,402.76/20,418.94
  6. Step 6: Final answer
    x = 9,582.84

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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.