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Finding the Fourth Proportional to 319.74, 479.50 and 137.08

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Solution

The fourth proportional to 319.74, 479.50 and 137.08 is: 205.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.74 : 479.50 = 137.08 : x
  2. Step 2: Convert to fraction form
    319.74/479.50 = 137.08/x
  3. Step 3: Cross multiply
    319.74x = 479.50 × 137.08
  4. Step 4: Simplify right side
    319.74x = 65,730.12
  5. Step 5: Solve for x
    x = 65,730.12/319.74
  6. Step 6: Final answer
    x = 205.58

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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.