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Finding the Fourth Proportional to 285.48, 425.25 and 279

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Solution

The fourth proportional to 285.48, 425.25 and 279 is: 415.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.48 : 425.25 = 279 : x
  2. Step 2: Convert to fraction form
    285.48/425.25 = 279/x
  3. Step 3: Cross multiply
    285.48x = 425.25 × 279
  4. Step 4: Simplify right side
    285.48x = 118,644.75
  5. Step 5: Solve for x
    x = 118,644.75/285.48
  6. Step 6: Final answer
    x = 415.60

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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.