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Finding the Fourth Proportional to 248.18, 372.28 and 139.89

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Solution

The fourth proportional to 248.18, 372.28 and 139.89 is: 209.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.18 : 372.28 = 139.89 : x
  2. Step 2: Convert to fraction form
    248.18/372.28 = 139.89/x
  3. Step 3: Cross multiply
    248.18x = 372.28 × 139.89
  4. Step 4: Simplify right side
    248.18x = 52,078.25
  5. Step 5: Solve for x
    x = 52,078.25/248.18
  6. Step 6: Final answer
    x = 209.84

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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.