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Finding the Fourth Proportional to 620.21, 930.65 and 255.25

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Solution

The fourth proportional to 620.21, 930.65 and 255.25 is: 383.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.21 : 930.65 = 255.25 : x
  2. Step 2: Convert to fraction form
    620.21/930.65 = 255.25/x
  3. Step 3: Cross multiply
    620.21x = 930.65 × 255.25
  4. Step 4: Simplify right side
    620.21x = 237,548.41
  5. Step 5: Solve for x
    x = 237,548.41/620.21
  6. Step 6: Final answer
    x = 383.01

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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.