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Finding the Fourth Proportional to 18,770.50, 28,155.75 and 4,919.50

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Solution

The fourth proportional to 18,770.50, 28,155.75 and 4,919.50 is: 7,379.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,770.50 : 28,155.75 = 4,919.50 : x
  2. Step 2: Convert to fraction form
    18,770.50/28,155.75 = 4,919.50/x
  3. Step 3: Cross multiply
    18,770.50x = 28,155.75 × 4,919.50
  4. Step 4: Simplify right side
    18,770.50x = 138,512,212.13
  5. Step 5: Solve for x
    x = 138,512,212.13/18,770.50
  6. Step 6: Final answer
    x = 7,379.25

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1.5x scale

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.