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Finding the Fourth Proportional to 328.26, 489.56 and 279.83

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Solution

The fourth proportional to 328.26, 489.56 and 279.83 is: 417.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.26 : 489.56 = 279.83 : x
  2. Step 2: Convert to fraction form
    328.26/489.56 = 279.83/x
  3. Step 3: Cross multiply
    328.26x = 489.56 × 279.83
  4. Step 4: Simplify right side
    328.26x = 136,991.83
  5. Step 5: Solve for x
    x = 136,991.83/328.26
  6. Step 6: Final answer
    x = 417.33

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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.