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Finding the Fourth Proportional to 518.52, 777.51 and 390

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Solution

The fourth proportional to 518.52, 777.51 and 390 is: 584.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.52 : 777.51 = 390 : x
  2. Step 2: Convert to fraction form
    518.52/777.51 = 390/x
  3. Step 3: Cross multiply
    518.52x = 777.51 × 390
  4. Step 4: Simplify right side
    518.52x = 303,228.90
  5. Step 5: Solve for x
    x = 303,228.90/518.52
  6. Step 6: Final answer
    x = 584.80

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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.