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Finding the Fourth Proportional to 1,186.20, 1,774.94 and 839.88

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Solution

The fourth proportional to 1,186.20, 1,774.94 and 839.88 is: 1,256.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.20 : 1,774.94 = 839.88 : x
  2. Step 2: Convert to fraction form
    1,186.20/1,774.94 = 839.88/x
  3. Step 3: Cross multiply
    1,186.20x = 1,774.94 × 839.88
  4. Step 4: Simplify right side
    1,186.20x = 1,490,732.41
  5. Step 5: Solve for x
    x = 1,490,732.41/1,186.20
  6. Step 6: Final answer
    x = 1,256.73

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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.