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Finding the Fourth Proportional to 516.96, 778.16 and 402

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Solution

The fourth proportional to 516.96, 778.16 and 402 is: 605.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.96 : 778.16 = 402 : x
  2. Step 2: Convert to fraction form
    516.96/778.16 = 402/x
  3. Step 3: Cross multiply
    516.96x = 778.16 × 402
  4. Step 4: Simplify right side
    516.96x = 312,820.32
  5. Step 5: Solve for x
    x = 312,820.32/516.96
  6. Step 6: Final answer
    x = 605.12

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.