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Finding the Fourth Proportional to 1,578.80, 2,178.90 and 1,179.77

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Solution

The fourth proportional to 1,578.80, 2,178.90 and 1,179.77 is: 1,628.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.80 : 2,178.90 = 1,179.77 : x
  2. Step 2: Convert to fraction form
    1,578.80/2,178.90 = 1,179.77/x
  3. Step 3: Cross multiply
    1,578.80x = 2,178.90 × 1,179.77
  4. Step 4: Simplify right side
    1,578.80x = 2,570,600.85
  5. Step 5: Solve for x
    x = 2,570,600.85/1,578.80
  6. Step 6: Final answer
    x = 1,628.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.