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Finding the Fourth Proportional to 1,143.54, 1,579.80 and 1,078.74

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Solution

The fourth proportional to 1,143.54, 1,579.80 and 1,078.74 is: 1,490.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.54 : 1,579.80 = 1,078.74 : x
  2. Step 2: Convert to fraction form
    1,143.54/1,579.80 = 1,078.74/x
  3. Step 3: Cross multiply
    1,143.54x = 1,579.80 × 1,078.74
  4. Step 4: Simplify right side
    1,143.54x = 1,704,193.45
  5. Step 5: Solve for x
    x = 1,704,193.45/1,143.54
  6. Step 6: Final answer
    x = 1,490.28

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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.