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Finding the Fourth Proportional to 518.04, 775.92 and 261

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Solution

The fourth proportional to 518.04, 775.92 and 261 is: 390.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.04 : 775.92 = 261 : x
  2. Step 2: Convert to fraction form
    518.04/775.92 = 261/x
  3. Step 3: Cross multiply
    518.04x = 775.92 × 261
  4. Step 4: Simplify right side
    518.04x = 202,515.12
  5. Step 5: Solve for x
    x = 202,515.12/518.04
  6. Step 6: Final answer
    x = 390.93

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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.