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Finding the Fourth Proportional to 518.61, 777.92 and 299.57

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Solution

The fourth proportional to 518.61, 777.92 and 299.57 is: 449.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.61 : 777.92 = 299.57 : x
  2. Step 2: Convert to fraction form
    518.61/777.92 = 299.57/x
  3. Step 3: Cross multiply
    518.61x = 777.92 × 299.57
  4. Step 4: Simplify right side
    518.61x = 233,039.02
  5. Step 5: Solve for x
    x = 233,039.02/518.61
  6. Step 6: Final answer
    x = 449.35

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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.