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Finding the Fourth Proportional to 1,187.58, 1,781.66 and 447.20

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Solution

The fourth proportional to 1,187.58, 1,781.66 and 447.20 is: 670.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.58 : 1,781.66 = 447.20 : x
  2. Step 2: Convert to fraction form
    1,187.58/1,781.66 = 447.20/x
  3. Step 3: Cross multiply
    1,187.58x = 1,781.66 × 447.20
  4. Step 4: Simplify right side
    1,187.58x = 796,758.35
  5. Step 5: Solve for x
    x = 796,758.35/1,187.58
  6. Step 6: Final answer
    x = 670.91

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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.