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Finding the Fourth Proportional to 517.68, 776.16 and 261

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Solution

The fourth proportional to 517.68, 776.16 and 261 is: 391.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.68 : 776.16 = 261 : x
  2. Step 2: Convert to fraction form
    517.68/776.16 = 261/x
  3. Step 3: Cross multiply
    517.68x = 776.16 × 261
  4. Step 4: Simplify right side
    517.68x = 202,577.76
  5. Step 5: Solve for x
    x = 202,577.76/517.68
  6. Step 6: Final answer
    x = 391.32

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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.