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Finding the Fourth Proportional to 519.95, 779.78 and 154.64

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Solution

The fourth proportional to 519.95, 779.78 and 154.64 is: 231.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.95 : 779.78 = 154.64 : x
  2. Step 2: Convert to fraction form
    519.95/779.78 = 154.64/x
  3. Step 3: Cross multiply
    519.95x = 779.78 × 154.64
  4. Step 4: Simplify right side
    519.95x = 120,580.51
  5. Step 5: Solve for x
    x = 120,580.51/519.95
  6. Step 6: Final answer
    x = 231.91

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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.