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Finding the Fourth Proportional to 674.80, 931.32 and 395.12

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Solution

The fourth proportional to 674.80, 931.32 and 395.12 is: 545.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.80 : 931.32 = 395.12 : x
  2. Step 2: Convert to fraction form
    674.80/931.32 = 395.12/x
  3. Step 3: Cross multiply
    674.80x = 931.32 × 395.12
  4. Step 4: Simplify right side
    674.80x = 367,983.16
  5. Step 5: Solve for x
    x = 367,983.16/674.80
  6. Step 6: Final answer
    x = 545.32

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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.