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Finding the Fourth Proportional to 1,185.55, 1,779.13 and 416.05

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Solution

The fourth proportional to 1,185.55, 1,779.13 and 416.05 is: 624.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.55 : 1,779.13 = 416.05 : x
  2. Step 2: Convert to fraction form
    1,185.55/1,779.13 = 416.05/x
  3. Step 3: Cross multiply
    1,185.55x = 1,779.13 × 416.05
  4. Step 4: Simplify right side
    1,185.55x = 740,202.59
  5. Step 5: Solve for x
    x = 740,202.59/1,185.55
  6. Step 6: Final answer
    x = 624.36

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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.