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Finding the Fourth Proportional to 1,185.64, 1,778.30 and 319.88

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Solution

The fourth proportional to 1,185.64, 1,778.30 and 319.88 is: 479.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.64 : 1,778.30 = 319.88 : x
  2. Step 2: Convert to fraction form
    1,185.64/1,778.30 = 319.88/x
  3. Step 3: Cross multiply
    1,185.64x = 1,778.30 × 319.88
  4. Step 4: Simplify right side
    1,185.64x = 568,842.60
  5. Step 5: Solve for x
    x = 568,842.60/1,185.64
  6. Step 6: Final answer
    x = 479.78

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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.