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Finding the Fourth Proportional to 304.82, 420.56 and 188.38

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Solution

The fourth proportional to 304.82, 420.56 and 188.38 is: 259.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.82 : 420.56 = 188.38 : x
  2. Step 2: Convert to fraction form
    304.82/420.56 = 188.38/x
  3. Step 3: Cross multiply
    304.82x = 420.56 × 188.38
  4. Step 4: Simplify right side
    304.82x = 79,225.09
  5. Step 5: Solve for x
    x = 79,225.09/304.82
  6. Step 6: Final answer
    x = 259.91

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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.