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Finding the Fourth Proportional to 18,911.71, 28,367.52 and 5,060.71

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Solution

The fourth proportional to 18,911.71, 28,367.52 and 5,060.71 is: 7,591.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.71 : 28,367.52 = 5,060.71 : x
  2. Step 2: Convert to fraction form
    18,911.71/28,367.52 = 5,060.71/x
  3. Step 3: Cross multiply
    18,911.71x = 28,367.52 × 5,060.71
  4. Step 4: Simplify right side
    18,911.71x = 143,559,792.14
  5. Step 5: Solve for x
    x = 143,559,792.14/18,911.71
  6. Step 6: Final answer
    x = 7,591.05

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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.