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Finding the Fourth Proportional to 1,385.51, 2,077.56 and 519.21

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Solution

The fourth proportional to 1,385.51, 2,077.56 and 519.21 is: 778.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.51 : 2,077.56 = 519.21 : x
  2. Step 2: Convert to fraction form
    1,385.51/2,077.56 = 519.21/x
  3. Step 3: Cross multiply
    1,385.51x = 2,077.56 × 519.21
  4. Step 4: Simplify right side
    1,385.51x = 1,078,689.93
  5. Step 5: Solve for x
    x = 1,078,689.93/1,385.51
  6. Step 6: Final answer
    x = 778.55

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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.