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Finding the Fourth Proportional to 1,180.91, 1,629.55 and 708.82

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Solution

The fourth proportional to 1,180.91, 1,629.55 and 708.82 is: 978.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.91 : 1,629.55 = 708.82 : x
  2. Step 2: Convert to fraction form
    1,180.91/1,629.55 = 708.82/x
  3. Step 3: Cross multiply
    1,180.91x = 1,629.55 × 708.82
  4. Step 4: Simplify right side
    1,180.91x = 1,155,054.44
  5. Step 5: Solve for x
    x = 1,155,054.44/1,180.91
  6. Step 6: Final answer
    x = 978.10

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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.