Home / 18,917.40-28,379.16-6,438.54

Finding the Fourth Proportional to 18,917.40, 28,379.16 and 6,438.54

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Solution

The fourth proportional to 18,917.40, 28,379.16 and 6,438.54 is: 9,658.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.40 : 28,379.16 = 6,438.54 : x
  2. Step 2: Convert to fraction form
    18,917.40/28,379.16 = 6,438.54/x
  3. Step 3: Cross multiply
    18,917.40x = 28,379.16 × 6,438.54
  4. Step 4: Simplify right side
    18,917.40x = 182,720,356.83
  5. Step 5: Solve for x
    x = 182,720,356.83/18,917.40
  6. Step 6: Final answer
    x = 9,658.85

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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.