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Finding the Fourth Proportional to 518.39, 777.02 and 286.76

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Solution

The fourth proportional to 518.39, 777.02 and 286.76 is: 429.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.39 : 777.02 = 286.76 : x
  2. Step 2: Convert to fraction form
    518.39/777.02 = 286.76/x
  3. Step 3: Cross multiply
    518.39x = 777.02 × 286.76
  4. Step 4: Simplify right side
    518.39x = 222,816.82
  5. Step 5: Solve for x
    x = 222,816.82/518.39
  6. Step 6: Final answer
    x = 429.82

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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.