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Finding the Fourth Proportional to 253.54, 379.88 and 137.72

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Solution

The fourth proportional to 253.54, 379.88 and 137.72 is: 206.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.54 : 379.88 = 137.72 : x
  2. Step 2: Convert to fraction form
    253.54/379.88 = 137.72/x
  3. Step 3: Cross multiply
    253.54x = 379.88 × 137.72
  4. Step 4: Simplify right side
    253.54x = 52,317.07
  5. Step 5: Solve for x
    x = 52,317.07/253.54
  6. Step 6: Final answer
    x = 206.35

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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.