Home / 18,991.07-28,485.18-7,438.64

Finding the Fourth Proportional to 18,991.07, 28,485.18 and 7,438.64

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Solution

The fourth proportional to 18,991.07, 28,485.18 and 7,438.64 is: 11,157.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.07 : 28,485.18 = 7,438.64 : x
  2. Step 2: Convert to fraction form
    18,991.07/28,485.18 = 7,438.64/x
  3. Step 3: Cross multiply
    18,991.07x = 28,485.18 × 7,438.64
  4. Step 4: Simplify right side
    18,991.07x = 211,891,070.57
  5. Step 5: Solve for x
    x = 211,891,070.57/18,991.07
  6. Step 6: Final answer
    x = 11,157.41

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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.