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Finding the Fourth Proportional to 321.75, 482.66 and 285.53

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Solution

The fourth proportional to 321.75, 482.66 and 285.53 is: 428.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.75 : 482.66 = 285.53 : x
  2. Step 2: Convert to fraction form
    321.75/482.66 = 285.53/x
  3. Step 3: Cross multiply
    321.75x = 482.66 × 285.53
  4. Step 4: Simplify right side
    321.75x = 137,810.07
  5. Step 5: Solve for x
    x = 137,810.07/321.75
  6. Step 6: Final answer
    x = 428.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.