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Finding the Fourth Proportional to 18,901.84, 28,359.24 and 7,216.80

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Solution

The fourth proportional to 18,901.84, 28,359.24 and 7,216.80 is: 10,827.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,901.84 : 28,359.24 = 7,216.80 : x
  2. Step 2: Convert to fraction form
    18,901.84/28,359.24 = 7,216.80/x
  3. Step 3: Cross multiply
    18,901.84x = 28,359.24 × 7,216.80
  4. Step 4: Simplify right side
    18,901.84x = 204,662,963.23
  5. Step 5: Solve for x
    x = 204,662,963.23/18,901.84
  6. Step 6: Final answer
    x = 10,827.67

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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.