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Finding the Fourth Proportional to 18,999.90, 28,499.85 and 16,885.80

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Solution

The fourth proportional to 18,999.90, 28,499.85 and 16,885.80 is: 25,328.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,999.90 : 28,499.85 = 16,885.80 : x
  2. Step 2: Convert to fraction form
    18,999.90/28,499.85 = 16,885.80/x
  3. Step 3: Cross multiply
    18,999.90x = 28,499.85 × 16,885.80
  4. Step 4: Simplify right side
    18,999.90x = 481,242,767.13
  5. Step 5: Solve for x
    x = 481,242,767.13/18,999.90
  6. Step 6: Final answer
    x = 25,328.70

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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.