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Finding the Fourth Proportional to 674.90, 931.39 and 380.26

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Solution

The fourth proportional to 674.90, 931.39 and 380.26 is: 524.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.90 : 931.39 = 380.26 : x
  2. Step 2: Convert to fraction form
    674.90/931.39 = 380.26/x
  3. Step 3: Cross multiply
    674.90x = 931.39 × 380.26
  4. Step 4: Simplify right side
    674.90x = 354,170.57
  5. Step 5: Solve for x
    x = 354,170.57/674.90
  6. Step 6: Final answer
    x = 524.78

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1.5x scale

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.