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Finding the Fourth Proportional to 518.68, 778.29 and 210.76

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Solution

The fourth proportional to 518.68, 778.29 and 210.76 is: 316.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.68 : 778.29 = 210.76 : x
  2. Step 2: Convert to fraction form
    518.68/778.29 = 210.76/x
  3. Step 3: Cross multiply
    518.68x = 778.29 × 210.76
  4. Step 4: Simplify right side
    518.68x = 164,032.40
  5. Step 5: Solve for x
    x = 164,032.40/518.68
  6. Step 6: Final answer
    x = 316.25

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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.