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Finding the Fourth Proportional to 319.50, 479.18 and 258.98

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Solution

The fourth proportional to 319.50, 479.18 and 258.98 is: 388.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.50 : 479.18 = 258.98 : x
  2. Step 2: Convert to fraction form
    319.50/479.18 = 258.98/x
  3. Step 3: Cross multiply
    319.50x = 479.18 × 258.98
  4. Step 4: Simplify right side
    319.50x = 124,096.29
  5. Step 5: Solve for x
    x = 124,096.29/319.50
  6. Step 6: Final answer
    x = 388.41

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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.