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Finding the Fourth Proportional to 519.80, 779.70 and 135.05

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Solution

The fourth proportional to 519.80, 779.70 and 135.05 is: 202.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.80 : 779.70 = 135.05 : x
  2. Step 2: Convert to fraction form
    519.80/779.70 = 135.05/x
  3. Step 3: Cross multiply
    519.80x = 779.70 × 135.05
  4. Step 4: Simplify right side
    519.80x = 105,297.51
  5. Step 5: Solve for x
    x = 105,297.51/519.80
  6. Step 6: Final answer
    x = 202.57

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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.