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Finding the Fourth Proportional to 328.69, 453.09 and 276.40

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Solution

The fourth proportional to 328.69, 453.09 and 276.40 is: 381.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.69 : 453.09 = 276.40 : x
  2. Step 2: Convert to fraction form
    328.69/453.09 = 276.40/x
  3. Step 3: Cross multiply
    328.69x = 453.09 × 276.40
  4. Step 4: Simplify right side
    328.69x = 125,234.08
  5. Step 5: Solve for x
    x = 125,234.08/328.69
  6. Step 6: Final answer
    x = 381.01

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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.