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Finding the Fourth Proportional to 674.42, 931.19 and 438.71

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Solution

The fourth proportional to 674.42, 931.19 and 438.71 is: 605.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.42 : 931.19 = 438.71 : x
  2. Step 2: Convert to fraction form
    674.42/931.19 = 438.71/x
  3. Step 3: Cross multiply
    674.42x = 931.19 × 438.71
  4. Step 4: Simplify right side
    674.42x = 408,522.36
  5. Step 5: Solve for x
    x = 408,522.36/674.42
  6. Step 6: Final answer
    x = 605.74

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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.