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Finding the Fourth Proportional to 18,765.80, 28,148.70 and 4,914.80

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Solution

The fourth proportional to 18,765.80, 28,148.70 and 4,914.80 is: 7,372.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.80 : 28,148.70 = 4,914.80 : x
  2. Step 2: Convert to fraction form
    18,765.80/28,148.70 = 4,914.80/x
  3. Step 3: Cross multiply
    18,765.80x = 28,148.70 × 4,914.80
  4. Step 4: Simplify right side
    18,765.80x = 138,345,230.76
  5. Step 5: Solve for x
    x = 138,345,230.76/18,765.80
  6. Step 6: Final answer
    x = 7,372.20

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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.