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Finding the Fourth Proportional to 319.99, 479.52 and 137.13

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Solution

The fourth proportional to 319.99, 479.52 and 137.13 is: 205.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.99 : 479.52 = 137.13 : x
  2. Step 2: Convert to fraction form
    319.99/479.52 = 137.13/x
  3. Step 3: Cross multiply
    319.99x = 479.52 × 137.13
  4. Step 4: Simplify right side
    319.99x = 65,754.18
  5. Step 5: Solve for x
    x = 65,754.18/319.99
  6. Step 6: Final answer
    x = 205.49

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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.