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Finding the Fourth Proportional to 1,185.88, 1,778.88 and 775.24

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Solution

The fourth proportional to 1,185.88, 1,778.88 and 775.24 is: 1,162.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.88 : 1,778.88 = 775.24 : x
  2. Step 2: Convert to fraction form
    1,185.88/1,778.88 = 775.24/x
  3. Step 3: Cross multiply
    1,185.88x = 1,778.88 × 775.24
  4. Step 4: Simplify right side
    1,185.88x = 1,379,058.93
  5. Step 5: Solve for x
    x = 1,379,058.93/1,185.88
  6. Step 6: Final answer
    x = 1,162.90

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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.