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Finding the Fourth Proportional to 209.00, 313.38 and 85.56

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Solution

The fourth proportional to 209.00, 313.38 and 85.56 is: 128.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.00 : 313.38 = 85.56 : x
  2. Step 2: Convert to fraction form
    209.00/313.38 = 85.56/x
  3. Step 3: Cross multiply
    209.00x = 313.38 × 85.56
  4. Step 4: Simplify right side
    209.00x = 26,813.60
  5. Step 5: Solve for x
    x = 26,813.60/209.00
  6. Step 6: Final answer
    x = 128.30

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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.