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Finding the Fourth Proportional to 248, 342.36 and 156

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Solution

The fourth proportional to 248, 342.36 and 156 is: 215.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    248 : 342.36 = 156 : x
  2. Step 2: Convert to fraction form
    248/342.36 = 156/x
  3. Step 3: Cross multiply
    248x = 342.36 × 156
  4. Step 4: Simplify right side
    248x = 53,408.16
  5. Step 5: Solve for x
    x = 53,408.16/248
  6. Step 6: Final answer
    x = 215.36

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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.