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Finding the Fourth Proportional to 674.23, 930.40 and 412.20

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Solution

The fourth proportional to 674.23, 930.40 and 412.20 is: 568.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.23 : 930.40 = 412.20 : x
  2. Step 2: Convert to fraction form
    674.23/930.40 = 412.20/x
  3. Step 3: Cross multiply
    674.23x = 930.40 × 412.20
  4. Step 4: Simplify right side
    674.23x = 383,510.88
  5. Step 5: Solve for x
    x = 383,510.88/674.23
  6. Step 6: Final answer
    x = 568.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.