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Finding the Fourth Proportional to 248.03, 342.31 and 149.78

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Solution

The fourth proportional to 248.03, 342.31 and 149.78 is: 206.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.03 : 342.31 = 149.78 : x
  2. Step 2: Convert to fraction form
    248.03/342.31 = 149.78/x
  3. Step 3: Cross multiply
    248.03x = 342.31 × 149.78
  4. Step 4: Simplify right side
    248.03x = 51,271.53
  5. Step 5: Solve for x
    x = 51,271.53/248.03
  6. Step 6: Final answer
    x = 206.72

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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.