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Finding the Fourth Proportional to 304.58, 420.86 and 239.60

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Solution

The fourth proportional to 304.58, 420.86 and 239.60 is: 331.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.58 : 420.86 = 239.60 : x
  2. Step 2: Convert to fraction form
    304.58/420.86 = 239.60/x
  3. Step 3: Cross multiply
    304.58x = 420.86 × 239.60
  4. Step 4: Simplify right side
    304.58x = 100,838.06
  5. Step 5: Solve for x
    x = 100,838.06/304.58
  6. Step 6: Final answer
    x = 331.07

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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.