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Finding the Fourth Proportional to 304.90, 421.05 and 276.10

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Solution

The fourth proportional to 304.90, 421.05 and 276.10 is: 381.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.90 : 421.05 = 276.10 : x
  2. Step 2: Convert to fraction form
    304.90/421.05 = 276.10/x
  3. Step 3: Cross multiply
    304.90x = 421.05 × 276.10
  4. Step 4: Simplify right side
    304.90x = 116,251.91
  5. Step 5: Solve for x
    x = 116,251.91/304.90
  6. Step 6: Final answer
    x = 381.28

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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.