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Finding the Fourth Proportional to 253.40, 349.16 and 198.05

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Solution

The fourth proportional to 253.40, 349.16 and 198.05 is: 272.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.40 : 349.16 = 198.05 : x
  2. Step 2: Convert to fraction form
    253.40/349.16 = 198.05/x
  3. Step 3: Cross multiply
    253.40x = 349.16 × 198.05
  4. Step 4: Simplify right side
    253.40x = 69,148.40
  5. Step 5: Solve for x
    x = 69,148.40/253.40
  6. Step 6: Final answer
    x = 272.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.