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Finding the Fourth Proportional to 209.17, 313.87 and 148.69

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Solution

The fourth proportional to 209.17, 313.87 and 148.69 is: 223.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.17 : 313.87 = 148.69 : x
  2. Step 2: Convert to fraction form
    209.17/313.87 = 148.69/x
  3. Step 3: Cross multiply
    209.17x = 313.87 × 148.69
  4. Step 4: Simplify right side
    209.17x = 46,669.33
  5. Step 5: Solve for x
    x = 46,669.33/209.17
  6. Step 6: Final answer
    x = 223.12

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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.