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Finding the Fourth Proportional to 620.85, 931.26 and 255.66

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Solution

The fourth proportional to 620.85, 931.26 and 255.66 is: 383.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.85 : 931.26 = 255.66 : x
  2. Step 2: Convert to fraction form
    620.85/931.26 = 255.66/x
  3. Step 3: Cross multiply
    620.85x = 931.26 × 255.66
  4. Step 4: Simplify right side
    620.85x = 238,085.93
  5. Step 5: Solve for x
    x = 238,085.93/620.85
  6. Step 6: Final answer
    x = 383.48

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Similar ratio
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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.