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Finding the Fourth Proportional to 621.13, 931.75 and 255.95

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Solution

The fourth proportional to 621.13, 931.75 and 255.95 is: 383.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.13 : 931.75 = 255.95 : x
  2. Step 2: Convert to fraction form
    621.13/931.75 = 255.95/x
  3. Step 3: Cross multiply
    621.13x = 931.75 × 255.95
  4. Step 4: Simplify right side
    621.13x = 238,479.74
  5. Step 5: Solve for x
    x = 238,479.74/621.13
  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.