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Finding the Fourth Proportional to 20,776.20, 28,671 and 11,344.68

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Solution

The fourth proportional to 20,776.20, 28,671 and 11,344.68 is: 15,655.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,776.20 : 28,671 = 11,344.68 : x
  2. Step 2: Convert to fraction form
    20,776.20/28,671 = 11,344.68/x
  3. Step 3: Cross multiply
    20,776.20x = 28,671 × 11,344.68
  4. Step 4: Simplify right side
    20,776.20x = 325,263,320.28
  5. Step 5: Solve for x
    x = 325,263,320.28/20,776.20
  6. Step 6: Final answer
    x = 15,655.57

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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.