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Finding the Fourth Proportional to 518.22, 776.07 and 388.08

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Solution

The fourth proportional to 518.22, 776.07 and 388.08 is: 581.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.22 : 776.07 = 388.08 : x
  2. Step 2: Convert to fraction form
    518.22/776.07 = 388.08/x
  3. Step 3: Cross multiply
    518.22x = 776.07 × 388.08
  4. Step 4: Simplify right side
    518.22x = 301,177.25
  5. Step 5: Solve for x
    x = 301,177.25/518.22
  6. Step 6: Final answer
    x = 581.18

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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.