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Finding the Fourth Proportional to 1,385.25, 2,078.27 and 519.63

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Solution

The fourth proportional to 1,385.25, 2,078.27 and 519.63 is: 779.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.25 : 2,078.27 = 519.63 : x
  2. Step 2: Convert to fraction form
    1,385.25/2,078.27 = 519.63/x
  3. Step 3: Cross multiply
    1,385.25x = 2,078.27 × 519.63
  4. Step 4: Simplify right side
    1,385.25x = 1,079,931.44
  5. Step 5: Solve for x
    x = 1,079,931.44/1,385.25
  6. Step 6: Final answer
    x = 779.59

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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.