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Finding the Fourth Proportional to 209.79, 312.63 and 203.54

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Solution

The fourth proportional to 209.79, 312.63 and 203.54 is: 303.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.79 : 312.63 = 203.54 : x
  2. Step 2: Convert to fraction form
    209.79/312.63 = 203.54/x
  3. Step 3: Cross multiply
    209.79x = 312.63 × 203.54
  4. Step 4: Simplify right side
    209.79x = 63,631.15
  5. Step 5: Solve for x
    x = 63,631.15/209.79
  6. Step 6: Final answer
    x = 303.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.