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Finding the Fourth Proportional to 1,191.33, 1,643.58 and 771.75

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Solution

The fourth proportional to 1,191.33, 1,643.58 and 771.75 is: 1,064.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.33 : 1,643.58 = 771.75 : x
  2. Step 2: Convert to fraction form
    1,191.33/1,643.58 = 771.75/x
  3. Step 3: Cross multiply
    1,191.33x = 1,643.58 × 771.75
  4. Step 4: Simplify right side
    1,191.33x = 1,268,432.87
  5. Step 5: Solve for x
    x = 1,268,432.87/1,191.33
  6. Step 6: Final answer
    x = 1,064.72

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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.