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Finding the Fourth Proportional to 1,185.56, 1,778.10 and 405.48

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Solution

The fourth proportional to 1,185.56, 1,778.10 and 405.48 is: 608.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.56 : 1,778.10 = 405.48 : x
  2. Step 2: Convert to fraction form
    1,185.56/1,778.10 = 405.48/x
  3. Step 3: Cross multiply
    1,185.56x = 1,778.10 × 405.48
  4. Step 4: Simplify right side
    1,185.56x = 720,983.99
  5. Step 5: Solve for x
    x = 720,983.99/1,185.56
  6. Step 6: Final answer
    x = 608.14

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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.