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Finding the Fourth Proportional to 674.89, 1,012.01 and 284.78

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Solution

The fourth proportional to 674.89, 1,012.01 and 284.78 is: 427.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.89 : 1,012.01 = 284.78 : x
  2. Step 2: Convert to fraction form
    674.89/1,012.01 = 284.78/x
  3. Step 3: Cross multiply
    674.89x = 1,012.01 × 284.78
  4. Step 4: Simplify right side
    674.89x = 288,200.21
  5. Step 5: Solve for x
    x = 288,200.21/674.89
  6. Step 6: Final answer
    x = 427.03

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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.