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Finding the Fourth Proportional to 18,699.40, 28,040.87 and 7,004.42

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Solution

The fourth proportional to 18,699.40, 28,040.87 and 7,004.42 is: 10,503.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,699.40 : 28,040.87 = 7,004.42 : x
  2. Step 2: Convert to fraction form
    18,699.40/28,040.87 = 7,004.42/x
  3. Step 3: Cross multiply
    18,699.40x = 28,040.87 × 7,004.42
  4. Step 4: Simplify right side
    18,699.40x = 196,409,907.95
  5. Step 5: Solve for x
    x = 196,409,907.95/18,699.40
  6. Step 6: Final answer
    x = 10,503.54

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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.