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Finding the Fourth Proportional to 518.49, 778 and 345.28

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Solution

The fourth proportional to 518.49, 778 and 345.28 is: 518.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.49 : 778 = 345.28 : x
  2. Step 2: Convert to fraction form
    518.49/778 = 345.28/x
  3. Step 3: Cross multiply
    518.49x = 778 × 345.28
  4. Step 4: Simplify right side
    518.49x = 268,627.84
  5. Step 5: Solve for x
    x = 268,627.84/518.49
  6. Step 6: Final answer
    x = 518.10

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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.