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Finding the Fourth Proportional to 319.42, 479.28 and 136.87

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Solution

The fourth proportional to 319.42, 479.28 and 136.87 is: 205.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.42 : 479.28 = 136.87 : x
  2. Step 2: Convert to fraction form
    319.42/479.28 = 136.87/x
  3. Step 3: Cross multiply
    319.42x = 479.28 × 136.87
  4. Step 4: Simplify right side
    319.42x = 65,598.37
  5. Step 5: Solve for x
    x = 65,598.37/319.42
  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.