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Finding the Fourth Proportional to 209,989.55, 315,131.95 and 189,912.89

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Solution

The fourth proportional to 209,989.55, 315,131.95 and 189,912.89 is: 285,002.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,989.55 : 315,131.95 = 189,912.89 : x
  2. Step 2: Convert to fraction form
    209,989.55/315,131.95 = 189,912.89/x
  3. Step 3: Cross multiply
    209,989.55x = 315,131.95 × 189,912.89
  4. Step 4: Simplify right side
    209,989.55x = 59,847,619,355.84
  5. Step 5: Solve for x
    x = 59,847,619,355.84/209,989.55
  6. Step 6: Final answer
    x = 285,002.85

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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.