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Finding the Fourth Proportional to 248.40, 372.42 and 187.20

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Solution

The fourth proportional to 248.40, 372.42 and 187.20 is: 280.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.40 : 372.42 = 187.20 : x
  2. Step 2: Convert to fraction form
    248.40/372.42 = 187.20/x
  3. Step 3: Cross multiply
    248.40x = 372.42 × 187.20
  4. Step 4: Simplify right side
    248.40x = 69,717.02
  5. Step 5: Solve for x
    x = 69,717.02/248.40
  6. Step 6: Final answer
    x = 280.66

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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.