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Finding the Fourth Proportional to 20,649.76, 28,503.20 and 13,197.76

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Solution

The fourth proportional to 20,649.76, 28,503.20 and 13,197.76 is: 18,217.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,649.76 : 28,503.20 = 13,197.76 : x
  2. Step 2: Convert to fraction form
    20,649.76/28,503.20 = 13,197.76/x
  3. Step 3: Cross multiply
    20,649.76x = 28,503.20 × 13,197.76
  4. Step 4: Simplify right side
    20,649.76x = 376,178,392.83
  5. Step 5: Solve for x
    x = 376,178,392.83/20,649.76
  6. Step 6: Final answer
    x = 18,217.08

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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.