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Finding the Fourth Proportional to 328.58, 490.48 and 287.59

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Solution

The fourth proportional to 328.58, 490.48 and 287.59 is: 429.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.58 : 490.48 = 287.59 : x
  2. Step 2: Convert to fraction form
    328.58/490.48 = 287.59/x
  3. Step 3: Cross multiply
    328.58x = 490.48 × 287.59
  4. Step 4: Simplify right side
    328.58x = 141,057.14
  5. Step 5: Solve for x
    x = 141,057.14/328.58
  6. Step 6: Final answer
    x = 429.29

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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.