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Finding the Fourth Proportional to 674.89, 931.36 and 409.38

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Solution

The fourth proportional to 674.89, 931.36 and 409.38 is: 564.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.89 : 931.36 = 409.38 : x
  2. Step 2: Convert to fraction form
    674.89/931.36 = 409.38/x
  3. Step 3: Cross multiply
    674.89x = 931.36 × 409.38
  4. Step 4: Simplify right side
    674.89x = 381,280.16
  5. Step 5: Solve for x
    x = 381,280.16/674.89
  6. Step 6: Final answer
    x = 564.95

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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.