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Finding the Fourth Proportional to 253.96, 348.38 and 247.20

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Solution

The fourth proportional to 253.96, 348.38 and 247.20 is: 339.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.96 : 348.38 = 247.20 : x
  2. Step 2: Convert to fraction form
    253.96/348.38 = 247.20/x
  3. Step 3: Cross multiply
    253.96x = 348.38 × 247.20
  4. Step 4: Simplify right side
    253.96x = 86,119.54
  5. Step 5: Solve for x
    x = 86,119.54/253.96
  6. Step 6: Final answer
    x = 339.11

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.