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Finding the Fourth Proportional to 209.58, 315.36 and 173.28

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Solution

The fourth proportional to 209.58, 315.36 and 173.28 is: 260.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.58 : 315.36 = 173.28 : x
  2. Step 2: Convert to fraction form
    209.58/315.36 = 173.28/x
  3. Step 3: Cross multiply
    209.58x = 315.36 × 173.28
  4. Step 4: Simplify right side
    209.58x = 54,645.58
  5. Step 5: Solve for x
    x = 54,645.58/209.58
  6. Step 6: Final answer
    x = 260.74

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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.