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Finding the Fourth Proportional to 18,525.41, 27,779.71 and 7,990.45

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Solution

The fourth proportional to 18,525.41, 27,779.71 and 7,990.45 is: 11,982.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,525.41 : 27,779.71 = 7,990.45 : x
  2. Step 2: Convert to fraction form
    18,525.41/27,779.71 = 7,990.45/x
  3. Step 3: Cross multiply
    18,525.41x = 27,779.71 × 7,990.45
  4. Step 4: Simplify right side
    18,525.41x = 221,972,309.33
  5. Step 5: Solve for x
    x = 221,972,309.33/18,525.41
  6. Step 6: Final answer
    x = 11,982.05

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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.