Home / 18,918.40-28,380.66-6,439.54

Finding the Fourth Proportional to 18,918.40, 28,380.66 and 6,439.54

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Solution

The fourth proportional to 18,918.40, 28,380.66 and 6,439.54 is: 9,660.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.40 : 28,380.66 = 6,439.54 : x
  2. Step 2: Convert to fraction form
    18,918.40/28,380.66 = 6,439.54/x
  3. Step 3: Cross multiply
    18,918.40x = 28,380.66 × 6,439.54
  4. Step 4: Simplify right side
    18,918.40x = 182,758,395.30
  5. Step 5: Solve for x
    x = 182,758,395.30/18,918.40
  6. Step 6: Final answer
    x = 9,660.35

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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.