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Finding the Fourth Proportional to 518.76, 777.98 and 287.76

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Solution

The fourth proportional to 518.76, 777.98 and 287.76 is: 431.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.76 : 777.98 = 287.76 : x
  2. Step 2: Convert to fraction form
    518.76/777.98 = 287.76/x
  3. Step 3: Cross multiply
    518.76x = 777.98 × 287.76
  4. Step 4: Simplify right side
    518.76x = 223,870.09
  5. Step 5: Solve for x
    x = 223,870.09/518.76
  6. Step 6: Final answer
    x = 431.55

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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.