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Finding the Fourth Proportional to 18,999.60, 28,499.40 and 18,610.80

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Solution

The fourth proportional to 18,999.60, 28,499.40 and 18,610.80 is: 27,916.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,999.60 : 28,499.40 = 18,610.80 : x
  2. Step 2: Convert to fraction form
    18,999.60/28,499.40 = 18,610.80/x
  3. Step 3: Cross multiply
    18,999.60x = 28,499.40 × 18,610.80
  4. Step 4: Simplify right side
    18,999.60x = 530,396,633.52
  5. Step 5: Solve for x
    x = 530,396,633.52/18,999.60
  6. Step 6: Final answer
    x = 27,916.20

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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.