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Finding the Fourth Proportional to 304.88, 420.88 and 206.80

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Solution

The fourth proportional to 304.88, 420.88 and 206.80 is: 285.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.88 : 420.88 = 206.80 : x
  2. Step 2: Convert to fraction form
    304.88/420.88 = 206.80/x
  3. Step 3: Cross multiply
    304.88x = 420.88 × 206.80
  4. Step 4: Simplify right side
    304.88x = 87,037.98
  5. Step 5: Solve for x
    x = 87,037.98/304.88
  6. Step 6: Final answer
    x = 285.48

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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.