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Finding the Fourth Proportional to 319.51, 479.30 and 136.91

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Solution

The fourth proportional to 319.51, 479.30 and 136.91 is: 205.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.51 : 479.30 = 136.91 : x
  2. Step 2: Convert to fraction form
    319.51/479.30 = 136.91/x
  3. Step 3: Cross multiply
    319.51x = 479.30 × 136.91
  4. Step 4: Simplify right side
    319.51x = 65,619.55
  5. Step 5: Solve for x
    x = 65,619.55/319.51
  6. Step 6: Final answer
    x = 205.37

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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.