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Finding the Fourth Proportional to 18,791.40, 28,200.78 and 15,137.76

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Solution

The fourth proportional to 18,791.40, 28,200.78 and 15,137.76 is: 22,717.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.40 : 28,200.78 = 15,137.76 : x
  2. Step 2: Convert to fraction form
    18,791.40/28,200.78 = 15,137.76/x
  3. Step 3: Cross multiply
    18,791.40x = 28,200.78 × 15,137.76
  4. Step 4: Simplify right side
    18,791.40x = 426,896,639.45
  5. Step 5: Solve for x
    x = 426,896,639.45/18,791.40
  6. Step 6: Final answer
    x = 22,717.66

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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.