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Finding the Fourth Proportional to 7,890.86, 10,879.71 and 6,393.26

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Solution

The fourth proportional to 7,890.86, 10,879.71 and 6,393.26 is: 8,814.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,890.86 : 10,879.71 = 6,393.26 : x
  2. Step 2: Convert to fraction form
    7,890.86/10,879.71 = 6,393.26/x
  3. Step 3: Cross multiply
    7,890.86x = 10,879.71 × 6,393.26
  4. Step 4: Simplify right side
    7,890.86x = 69,556,814.75
  5. Step 5: Solve for x
    x = 69,556,814.75/7,890.86
  6. Step 6: Final answer
    x = 8,814.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.