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Finding the Fourth Proportional to 248.40, 372.60 and 138.60

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Solution

The fourth proportional to 248.40, 372.60 and 138.60 is: 207.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.40 : 372.60 = 138.60 : x
  2. Step 2: Convert to fraction form
    248.40/372.60 = 138.60/x
  3. Step 3: Cross multiply
    248.40x = 372.60 × 138.60
  4. Step 4: Simplify right side
    248.40x = 51,642.36
  5. Step 5: Solve for x
    x = 51,642.36/248.40
  6. Step 6: Final answer
    x = 207.90

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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.