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Finding the Fourth Proportional to 674.75, 931.14 and 394.99

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Solution

The fourth proportional to 674.75, 931.14 and 394.99 is: 545.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.75 : 931.14 = 394.99 : x
  2. Step 2: Convert to fraction form
    674.75/931.14 = 394.99/x
  3. Step 3: Cross multiply
    674.75x = 931.14 × 394.99
  4. Step 4: Simplify right side
    674.75x = 367,792.79
  5. Step 5: Solve for x
    x = 367,792.79/674.75
  6. Step 6: Final answer
    x = 545.08

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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.