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Finding the Fourth Proportional to 18,905.80, 28,358.70 and 5,054.80

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Solution

The fourth proportional to 18,905.80, 28,358.70 and 5,054.80 is: 7,582.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.80 : 28,358.70 = 5,054.80 : x
  2. Step 2: Convert to fraction form
    18,905.80/28,358.70 = 5,054.80/x
  3. Step 3: Cross multiply
    18,905.80x = 28,358.70 × 5,054.80
  4. Step 4: Simplify right side
    18,905.80x = 143,347,556.76
  5. Step 5: Solve for x
    x = 143,347,556.76/18,905.80
  6. Step 6: Final answer
    x = 7,582.20

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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.