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Finding the Fourth Proportional to 1,186.25, 1,779.62 and 638.96

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Solution

The fourth proportional to 1,186.25, 1,779.62 and 638.96 is: 958.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.25 : 1,779.62 = 638.96 : x
  2. Step 2: Convert to fraction form
    1,186.25/1,779.62 = 638.96/x
  3. Step 3: Cross multiply
    1,186.25x = 1,779.62 × 638.96
  4. Step 4: Simplify right side
    1,186.25x = 1,137,093.90
  5. Step 5: Solve for x
    x = 1,137,093.90/1,186.25
  6. Step 6: Final answer
    x = 958.57

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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.