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Finding the Fourth Proportional to 21,913.76, 30,237.84 and 12,480.80

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Solution

The fourth proportional to 21,913.76, 30,237.84 and 12,480.80 is: 17,221.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,913.76 : 30,237.84 = 12,480.80 : x
  2. Step 2: Convert to fraction form
    21,913.76/30,237.84 = 12,480.80/x
  3. Step 3: Cross multiply
    21,913.76x = 30,237.84 × 12,480.80
  4. Step 4: Simplify right side
    21,913.76x = 377,392,433.47
  5. Step 5: Solve for x
    x = 377,392,433.47/21,913.76
  6. Step 6: Final answer
    x = 17,221.71

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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.