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Finding the Fourth Proportional to 1,187.81, 1,779.89 and 1,005.56

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Solution

The fourth proportional to 1,187.81, 1,779.89 and 1,005.56 is: 1,506.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.81 : 1,779.89 = 1,005.56 : x
  2. Step 2: Convert to fraction form
    1,187.81/1,779.89 = 1,005.56/x
  3. Step 3: Cross multiply
    1,187.81x = 1,779.89 × 1,005.56
  4. Step 4: Simplify right side
    1,187.81x = 1,789,772.26
  5. Step 5: Solve for x
    x = 1,789,772.26/1,187.81
  6. Step 6: Final answer
    x = 1,506.79

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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.