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Finding the Fourth Proportional to 1,191.24, 1,786.86 and 643.95

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Solution

The fourth proportional to 1,191.24, 1,786.86 and 643.95 is: 965.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.24 : 1,786.86 = 643.95 : x
  2. Step 2: Convert to fraction form
    1,191.24/1,786.86 = 643.95/x
  3. Step 3: Cross multiply
    1,191.24x = 1,786.86 × 643.95
  4. Step 4: Simplify right side
    1,191.24x = 1,150,648.50
  5. Step 5: Solve for x
    x = 1,150,648.50/1,191.24
  6. Step 6: Final answer
    x = 965.93

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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.