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Finding the Fourth Proportional to 20,388.89, 30,582.95 and 8,378.49

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Solution

The fourth proportional to 20,388.89, 30,582.95 and 8,378.49 is: 12,567.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.89 : 30,582.95 = 8,378.49 : x
  2. Step 2: Convert to fraction form
    20,388.89/30,582.95 = 8,378.49/x
  3. Step 3: Cross multiply
    20,388.89x = 30,582.95 × 8,378.49
  4. Step 4: Simplify right side
    20,388.89x = 256,238,961.69
  5. Step 5: Solve for x
    x = 256,238,961.69/20,388.89
  6. Step 6: Final answer
    x = 12,567.58

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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.