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Finding the Fourth Proportional to 1,078.88, 1,619.67 and 917.58

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Solution

The fourth proportional to 1,078.88, 1,619.67 and 917.58 is: 1,377.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.88 : 1,619.67 = 917.58 : x
  2. Step 2: Convert to fraction form
    1,078.88/1,619.67 = 917.58/x
  3. Step 3: Cross multiply
    1,078.88x = 1,619.67 × 917.58
  4. Step 4: Simplify right side
    1,078.88x = 1,486,186.31
  5. Step 5: Solve for x
    x = 1,486,186.31/1,078.88
  6. Step 6: Final answer
    x = 1,377.53

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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.