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Finding the Fourth Proportional to 18,999.70, 28,499.55 and 12,778.90

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Solution

The fourth proportional to 18,999.70, 28,499.55 and 12,778.90 is: 19,168.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,999.70 : 28,499.55 = 12,778.90 : x
  2. Step 2: Convert to fraction form
    18,999.70/28,499.55 = 12,778.90/x
  3. Step 3: Cross multiply
    18,999.70x = 28,499.55 × 12,778.90
  4. Step 4: Simplify right side
    18,999.70x = 364,192,899.50
  5. Step 5: Solve for x
    x = 364,192,899.50/18,999.70
  6. Step 6: Final answer
    x = 19,168.35

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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.