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Finding the Fourth Proportional to 620.76, 930.66 and 255.79

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Solution

The fourth proportional to 620.76, 930.66 and 255.79 is: 383.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.76 : 930.66 = 255.79 : x
  2. Step 2: Convert to fraction form
    620.76/930.66 = 255.79/x
  3. Step 3: Cross multiply
    620.76x = 930.66 × 255.79
  4. Step 4: Simplify right side
    620.76x = 238,053.73
  5. Step 5: Solve for x
    x = 238,053.73/620.76
  6. Step 6: Final answer
    x = 383.49

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1.5x scale

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.