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Finding the Fourth Proportional to 287.63, 428.67 and 285.23

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Solution

The fourth proportional to 287.63, 428.67 and 285.23 is: 425.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.63 : 428.67 = 285.23 : x
  2. Step 2: Convert to fraction form
    287.63/428.67 = 285.23/x
  3. Step 3: Cross multiply
    287.63x = 428.67 × 285.23
  4. Step 4: Simplify right side
    287.63x = 122,269.54
  5. Step 5: Solve for x
    x = 122,269.54/287.63
  6. Step 6: Final answer
    x = 425.09

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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.