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Finding the Fourth Proportional to 1,191.70, 1,643.38 and 771.99

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Solution

The fourth proportional to 1,191.70, 1,643.38 and 771.99 is: 1,064.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.70 : 1,643.38 = 771.99 : x
  2. Step 2: Convert to fraction form
    1,191.70/1,643.38 = 771.99/x
  3. Step 3: Cross multiply
    1,191.70x = 1,643.38 × 771.99
  4. Step 4: Simplify right side
    1,191.70x = 1,268,672.93
  5. Step 5: Solve for x
    x = 1,268,672.93/1,191.70
  6. Step 6: Final answer
    x = 1,064.59

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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.