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Finding the Fourth Proportional to 629.96, 939.81 and 613.86

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Solution

The fourth proportional to 629.96, 939.81 and 613.86 is: 915.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.96 : 939.81 = 613.86 : x
  2. Step 2: Convert to fraction form
    629.96/939.81 = 613.86/x
  3. Step 3: Cross multiply
    629.96x = 939.81 × 613.86
  4. Step 4: Simplify right side
    629.96x = 576,911.77
  5. Step 5: Solve for x
    x = 576,911.77/629.96
  6. Step 6: Final answer
    x = 915.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.