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Finding the Fourth Proportional to 18,929.18, 28,404.02 and 7,091.02

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Solution

The fourth proportional to 18,929.18, 28,404.02 and 7,091.02 is: 10,640.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,929.18 : 28,404.02 = 7,091.02 : x
  2. Step 2: Convert to fraction form
    18,929.18/28,404.02 = 7,091.02/x
  3. Step 3: Cross multiply
    18,929.18x = 28,404.02 × 7,091.02
  4. Step 4: Simplify right side
    18,929.18x = 201,413,473.90
  5. Step 5: Solve for x
    x = 201,413,473.90/18,929.18
  6. Step 6: Final answer
    x = 10,640.37

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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.