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Finding the Fourth Proportional to 304.83, 421.62 and 285.18

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Solution

The fourth proportional to 304.83, 421.62 and 285.18 is: 394.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.83 : 421.62 = 285.18 : x
  2. Step 2: Convert to fraction form
    304.83/421.62 = 285.18/x
  3. Step 3: Cross multiply
    304.83x = 421.62 × 285.18
  4. Step 4: Simplify right side
    304.83x = 120,237.59
  5. Step 5: Solve for x
    x = 120,237.59/304.83
  6. Step 6: Final answer
    x = 394.44

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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.