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Finding the Fourth Proportional to 1,185.94, 1,779.30 and 455.72

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Solution

The fourth proportional to 1,185.94, 1,779.30 and 455.72 is: 683.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.94 : 1,779.30 = 455.72 : x
  2. Step 2: Convert to fraction form
    1,185.94/1,779.30 = 455.72/x
  3. Step 3: Cross multiply
    1,185.94x = 1,779.30 × 455.72
  4. Step 4: Simplify right side
    1,185.94x = 810,862.60
  5. Step 5: Solve for x
    x = 810,862.60/1,185.94
  6. Step 6: Final answer
    x = 683.73

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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.