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Finding the Fourth Proportional to 674.37, 1,012.14 and 428.13

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Solution

The fourth proportional to 674.37, 1,012.14 and 428.13 is: 642.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.37 : 1,012.14 = 428.13 : x
  2. Step 2: Convert to fraction form
    674.37/1,012.14 = 428.13/x
  3. Step 3: Cross multiply
    674.37x = 1,012.14 × 428.13
  4. Step 4: Simplify right side
    674.37x = 433,327.50
  5. Step 5: Solve for x
    x = 433,327.50/674.37
  6. Step 6: Final answer
    x = 642.57

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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.