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Finding the Fourth Proportional to 18,999.72, 28,490.85 and 7,899.80

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Solution

The fourth proportional to 18,999.72, 28,490.85 and 7,899.80 is: 11,846.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,999.72 : 28,490.85 = 7,899.80 : x
  2. Step 2: Convert to fraction form
    18,999.72/28,490.85 = 7,899.80/x
  3. Step 3: Cross multiply
    18,999.72x = 28,490.85 × 7,899.80
  4. Step 4: Simplify right side
    18,999.72x = 225,071,874.38
  5. Step 5: Solve for x
    x = 225,071,874.38/18,999.72
  6. Step 6: Final answer
    x = 11,846.06

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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.