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Finding the Fourth Proportional to 518.15, 777.21 and 133.40

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Solution

The fourth proportional to 518.15, 777.21 and 133.40 is: 200.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.15 : 777.21 = 133.40 : x
  2. Step 2: Convert to fraction form
    518.15/777.21 = 133.40/x
  3. Step 3: Cross multiply
    518.15x = 777.21 × 133.40
  4. Step 4: Simplify right side
    518.15x = 103,675.93
  5. Step 5: Solve for x
    x = 103,675.93/518.15
  6. Step 6: Final answer
    x = 200.09

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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.