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Finding the Fourth Proportional to 18,753.60, 28,115.81 and 9,388.80

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Solution

The fourth proportional to 18,753.60, 28,115.81 and 9,388.80 is: 14,075.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,753.60 : 28,115.81 = 9,388.80 : x
  2. Step 2: Convert to fraction form
    18,753.60/28,115.81 = 9,388.80/x
  3. Step 3: Cross multiply
    18,753.60x = 28,115.81 × 9,388.80
  4. Step 4: Simplify right side
    18,753.60x = 263,973,669.98
  5. Step 5: Solve for x
    x = 263,973,669.98/18,753.60
  6. Step 6: Final answer
    x = 14,075.89

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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.