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Finding the Fourth Proportional to 1,187.98, 1,779.58 and 994.91

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Solution

The fourth proportional to 1,187.98, 1,779.58 and 994.91 is: 1,490.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.98 : 1,779.58 = 994.91 : x
  2. Step 2: Convert to fraction form
    1,187.98/1,779.58 = 994.91/x
  3. Step 3: Cross multiply
    1,187.98x = 1,779.58 × 994.91
  4. Step 4: Simplify right side
    1,187.98x = 1,770,516.96
  5. Step 5: Solve for x
    x = 1,770,516.96/1,187.98
  6. Step 6: Final answer
    x = 1,490.36

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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.