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Finding the Fourth Proportional to 518.99, 715.92 and 361.35

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Solution

The fourth proportional to 518.99, 715.92 and 361.35 is: 498.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.99 : 715.92 = 361.35 : x
  2. Step 2: Convert to fraction form
    518.99/715.92 = 361.35/x
  3. Step 3: Cross multiply
    518.99x = 715.92 × 361.35
  4. Step 4: Simplify right side
    518.99x = 258,697.69
  5. Step 5: Solve for x
    x = 258,697.69/518.99
  6. Step 6: Final answer
    x = 498.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.