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Finding the Fourth Proportional to 319.95, 441.59 and 209.39

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Solution

The fourth proportional to 319.95, 441.59 and 209.39 is: 288.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.95 : 441.59 = 209.39 : x
  2. Step 2: Convert to fraction form
    319.95/441.59 = 209.39/x
  3. Step 3: Cross multiply
    319.95x = 441.59 × 209.39
  4. Step 4: Simplify right side
    319.95x = 92,461.28
  5. Step 5: Solve for x
    x = 92,461.28/319.95
  6. Step 6: Final answer
    x = 288.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.