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Finding the Fourth Proportional to 7,158.90, 9,879.78 and 4,173.60

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Solution

The fourth proportional to 7,158.90, 9,879.78 and 4,173.60 is: 5,759.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,158.90 : 9,879.78 = 4,173.60 : x
  2. Step 2: Convert to fraction form
    7,158.90/9,879.78 = 4,173.60/x
  3. Step 3: Cross multiply
    7,158.90x = 9,879.78 × 4,173.60
  4. Step 4: Simplify right side
    7,158.90x = 41,234,249.81
  5. Step 5: Solve for x
    x = 41,234,249.81/7,158.90
  6. Step 6: Final answer
    x = 5,759.86

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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.