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Finding the Fourth Proportional to 518.18, 715.77 and 386.96

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Solution

The fourth proportional to 518.18, 715.77 and 386.96 is: 534.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.18 : 715.77 = 386.96 : x
  2. Step 2: Convert to fraction form
    518.18/715.77 = 386.96/x
  3. Step 3: Cross multiply
    518.18x = 715.77 × 386.96
  4. Step 4: Simplify right side
    518.18x = 276,974.36
  5. Step 5: Solve for x
    x = 276,974.36/518.18
  6. Step 6: Final answer
    x = 534.51

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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.