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Finding the Fourth Proportional to 518.81, 777.44 and 388.19

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Solution

The fourth proportional to 518.81, 777.44 and 388.19 is: 581.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.81 : 777.44 = 388.19 : x
  2. Step 2: Convert to fraction form
    518.81/777.44 = 388.19/x
  3. Step 3: Cross multiply
    518.81x = 777.44 × 388.19
  4. Step 4: Simplify right side
    518.81x = 301,797.35
  5. Step 5: Solve for x
    x = 301,797.35/518.81
  6. Step 6: Final answer
    x = 581.72

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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.