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Finding the Fourth Proportional to 1,186.45, 1,638.13 and 854.98

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Solution

The fourth proportional to 1,186.45, 1,638.13 and 854.98 is: 1,180.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.45 : 1,638.13 = 854.98 : x
  2. Step 2: Convert to fraction form
    1,186.45/1,638.13 = 854.98/x
  3. Step 3: Cross multiply
    1,186.45x = 1,638.13 × 854.98
  4. Step 4: Simplify right side
    1,186.45x = 1,400,568.39
  5. Step 5: Solve for x
    x = 1,400,568.39/1,186.45
  6. Step 6: Final answer
    x = 1,180.47

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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.