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Finding the Fourth Proportional to 345.65, 477 and 198.25

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Solution

The fourth proportional to 345.65, 477 and 198.25 is: 273.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.65 : 477 = 198.25 : x
  2. Step 2: Convert to fraction form
    345.65/477 = 198.25/x
  3. Step 3: Cross multiply
    345.65x = 477 × 198.25
  4. Step 4: Simplify right side
    345.65x = 94,564.06
  5. Step 5: Solve for x
    x = 94,564.06/345.65
  6. Step 6: Final answer
    x = 273.59

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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.