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Finding the Fourth Proportional to 18,999.40, 28,499.10 and 5,855.80

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Solution

The fourth proportional to 18,999.40, 28,499.10 and 5,855.80 is: 8,783.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,999.40 : 28,499.10 = 5,855.80 : x
  2. Step 2: Convert to fraction form
    18,999.40/28,499.10 = 5,855.80/x
  3. Step 3: Cross multiply
    18,999.40x = 28,499.10 × 5,855.80
  4. Step 4: Simplify right side
    18,999.40x = 166,885,029.78
  5. Step 5: Solve for x
    x = 166,885,029.78/18,999.40
  6. Step 6: Final answer
    x = 8,783.70

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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.