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Finding the Fourth Proportional to 5,235.80, 7,869.90 and 5,138.60

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Solution

The fourth proportional to 5,235.80, 7,869.90 and 5,138.60 is: 7,723.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,235.80 : 7,869.90 = 5,138.60 : x
  2. Step 2: Convert to fraction form
    5,235.80/7,869.90 = 5,138.60/x
  3. Step 3: Cross multiply
    5,235.80x = 7,869.90 × 5,138.60
  4. Step 4: Simplify right side
    5,235.80x = 40,440,268.14
  5. Step 5: Solve for x
    x = 40,440,268.14/5,235.80
  6. Step 6: Final answer
    x = 7,723.80

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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.