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Finding the Fourth Proportional to 328.70, 490.47 and 274.70

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Solution

The fourth proportional to 328.70, 490.47 and 274.70 is: 409.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.70 : 490.47 = 274.70 : x
  2. Step 2: Convert to fraction form
    328.70/490.47 = 274.70/x
  3. Step 3: Cross multiply
    328.70x = 490.47 × 274.70
  4. Step 4: Simplify right side
    328.70x = 134,732.11
  5. Step 5: Solve for x
    x = 134,732.11/328.70
  6. Step 6: Final answer
    x = 409.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.