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Finding the Fourth Proportional to 518.29, 776.89 and 261.25

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Solution

The fourth proportional to 518.29, 776.89 and 261.25 is: 391.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.29 : 776.89 = 261.25 : x
  2. Step 2: Convert to fraction form
    518.29/776.89 = 261.25/x
  3. Step 3: Cross multiply
    518.29x = 776.89 × 261.25
  4. Step 4: Simplify right side
    518.29x = 202,962.51
  5. Step 5: Solve for x
    x = 202,962.51/518.29
  6. Step 6: Final answer
    x = 391.60

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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.