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Finding the Fourth Proportional to 486.99, 730.13 and 255.78

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Solution

The fourth proportional to 486.99, 730.13 and 255.78 is: 383.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.99 : 730.13 = 255.78 : x
  2. Step 2: Convert to fraction form
    486.99/730.13 = 255.78/x
  3. Step 3: Cross multiply
    486.99x = 730.13 × 255.78
  4. Step 4: Simplify right side
    486.99x = 186,751.37
  5. Step 5: Solve for x
    x = 186,751.37/486.99
  6. Step 6: Final answer
    x = 383.48

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Double scale
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Similar ratio
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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.