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Finding the Fourth Proportional to 1,191.90, 1,785.78 and 644.46

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Solution

The fourth proportional to 1,191.90, 1,785.78 and 644.46 is: 965.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.90 : 1,785.78 = 644.46 : x
  2. Step 2: Convert to fraction form
    1,191.90/1,785.78 = 644.46/x
  3. Step 3: Cross multiply
    1,191.90x = 1,785.78 × 644.46
  4. Step 4: Simplify right side
    1,191.90x = 1,150,857.08
  5. Step 5: Solve for x
    x = 1,150,857.08/1,191.90
  6. Step 6: Final answer
    x = 965.57

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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.