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Finding the Fourth Proportional to 379.98, 524.13 and 318.12

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Solution

The fourth proportional to 379.98, 524.13 and 318.12 is: 438.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.98 : 524.13 = 318.12 : x
  2. Step 2: Convert to fraction form
    379.98/524.13 = 318.12/x
  3. Step 3: Cross multiply
    379.98x = 524.13 × 318.12
  4. Step 4: Simplify right side
    379.98x = 166,736.24
  5. Step 5: Solve for x
    x = 166,736.24/379.98
  6. Step 6: Final answer
    x = 438.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.