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Finding the Fourth Proportional to 18,768.50, 28,152.75 and 7,078.99

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Solution

The fourth proportional to 18,768.50, 28,152.75 and 7,078.99 is: 10,618.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,768.50 : 28,152.75 = 7,078.99 : x
  2. Step 2: Convert to fraction form
    18,768.50/28,152.75 = 7,078.99/x
  3. Step 3: Cross multiply
    18,768.50x = 28,152.75 × 7,078.99
  4. Step 4: Simplify right side
    18,768.50x = 199,292,894.96
  5. Step 5: Solve for x
    x = 199,292,894.96/18,768.50
  6. Step 6: Final answer
    x = 10,618.48

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Double scale
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Similar ratio
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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.