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Finding the Fourth Proportional to 18,984.90, 28,480.43 and 7,139.60

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Solution

The fourth proportional to 18,984.90, 28,480.43 and 7,139.60 is: 10,710.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,984.90 : 28,480.43 = 7,139.60 : x
  2. Step 2: Convert to fraction form
    18,984.90/28,480.43 = 7,139.60/x
  3. Step 3: Cross multiply
    18,984.90x = 28,480.43 × 7,139.60
  4. Step 4: Simplify right side
    18,984.90x = 203,338,878.03
  5. Step 5: Solve for x
    x = 203,338,878.03/18,984.90
  6. Step 6: Final answer
    x = 10,710.56

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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.