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Finding the Fourth Proportional to 621.19, 931.74 and 255.97

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Solution

The fourth proportional to 621.19, 931.74 and 255.97 is: 383.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.19 : 931.74 = 255.97 : x
  2. Step 2: Convert to fraction form
    621.19/931.74 = 255.97/x
  3. Step 3: Cross multiply
    621.19x = 931.74 × 255.97
  4. Step 4: Simplify right side
    621.19x = 238,497.49
  5. Step 5: Solve for x
    x = 238,497.49/621.19
  6. Step 6: Final answer
    x = 383.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.