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Finding the Fourth Proportional to 317.78, 438.72 and 248

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Solution

The fourth proportional to 317.78, 438.72 and 248 is: 342.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.78 : 438.72 = 248 : x
  2. Step 2: Convert to fraction form
    317.78/438.72 = 248/x
  3. Step 3: Cross multiply
    317.78x = 438.72 × 248
  4. Step 4: Simplify right side
    317.78x = 108,802.56
  5. Step 5: Solve for x
    x = 108,802.56/317.78
  6. Step 6: Final answer
    x = 342.38

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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.