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Finding the Fourth Proportional to 518.49, 776.79 and 313.11

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Solution

The fourth proportional to 518.49, 776.79 and 313.11 is: 469.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.49 : 776.79 = 313.11 : x
  2. Step 2: Convert to fraction form
    518.49/776.79 = 313.11/x
  3. Step 3: Cross multiply
    518.49x = 776.79 × 313.11
  4. Step 4: Simplify right side
    518.49x = 243,220.72
  5. Step 5: Solve for x
    x = 243,220.72/518.49
  6. Step 6: Final answer
    x = 469.09

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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.