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Finding the Fourth Proportional to 1,161.41, 1,742.90 and 771.86

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Solution

The fourth proportional to 1,161.41, 1,742.90 and 771.86 is: 1,158.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.41 : 1,742.90 = 771.86 : x
  2. Step 2: Convert to fraction form
    1,161.41/1,742.90 = 771.86/x
  3. Step 3: Cross multiply
    1,161.41x = 1,742.90 × 771.86
  4. Step 4: Simplify right side
    1,161.41x = 1,345,274.79
  5. Step 5: Solve for x
    x = 1,345,274.79/1,161.41
  6. Step 6: Final answer
    x = 1,158.31

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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.