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Finding the Fourth Proportional to 674.82, 931.21 and 395.05

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Solution

The fourth proportional to 674.82, 931.21 and 395.05 is: 545.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.82 : 931.21 = 395.05 : x
  2. Step 2: Convert to fraction form
    674.82/931.21 = 395.05/x
  3. Step 3: Cross multiply
    674.82x = 931.21 × 395.05
  4. Step 4: Simplify right side
    674.82x = 367,874.51
  5. Step 5: Solve for x
    x = 367,874.51/674.82
  6. Step 6: Final answer
    x = 545.14

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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.