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Finding the Fourth Proportional to 18,740.40, 28,125 and 9,978

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Solution

The fourth proportional to 18,740.40, 28,125 and 9,978 is: 14,974.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,740.40 : 28,125 = 9,978 : x
  2. Step 2: Convert to fraction form
    18,740.40/28,125 = 9,978/x
  3. Step 3: Cross multiply
    18,740.40x = 28,125 × 9,978
  4. Step 4: Simplify right side
    18,740.40x = 280,631,250
  5. Step 5: Solve for x
    x = 280,631,250/18,740.40
  6. Step 6: Final answer
    x = 14,974.67

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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.