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Finding the Fourth Proportional to 18,420.18, 27,609.75 and 7,323.90

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Solution

The fourth proportional to 18,420.18, 27,609.75 and 7,323.90 is: 10,977.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.18 : 27,609.75 = 7,323.90 : x
  2. Step 2: Convert to fraction form
    18,420.18/27,609.75 = 7,323.90/x
  3. Step 3: Cross multiply
    18,420.18x = 27,609.75 × 7,323.90
  4. Step 4: Simplify right side
    18,420.18x = 202,211,048.03
  5. Step 5: Solve for x
    x = 202,211,048.03/18,420.18
  6. Step 6: Final answer
    x = 10,977.69

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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.