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Finding the Fourth Proportional to 1,179.88, 1,628.25 and 648.78

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Solution

The fourth proportional to 1,179.88, 1,628.25 and 648.78 is: 895.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.88 : 1,628.25 = 648.78 : x
  2. Step 2: Convert to fraction form
    1,179.88/1,628.25 = 648.78/x
  3. Step 3: Cross multiply
    1,179.88x = 1,628.25 × 648.78
  4. Step 4: Simplify right side
    1,179.88x = 1,056,379.62
  5. Step 5: Solve for x
    x = 1,056,379.62/1,179.88
  6. Step 6: Final answer
    x = 895.33

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1.5x scale

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.