Home / 1,191.25-1,786.12-459.95

Finding the Fourth Proportional to 1,191.25, 1,786.12 and 459.95

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Solution

The fourth proportional to 1,191.25, 1,786.12 and 459.95 is: 689.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.25 : 1,786.12 = 459.95 : x
  2. Step 2: Convert to fraction form
    1,191.25/1,786.12 = 459.95/x
  3. Step 3: Cross multiply
    1,191.25x = 1,786.12 × 459.95
  4. Step 4: Simplify right side
    1,191.25x = 821,525.89
  5. Step 5: Solve for x
    x = 821,525.89/1,191.25
  6. Step 6: Final answer
    x = 689.63

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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.