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Finding the Fourth Proportional to 1,187.97, 1,780.38 and 638.97

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Solution

The fourth proportional to 1,187.97, 1,780.38 and 638.97 is: 957.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.97 : 1,780.38 = 638.97 : x
  2. Step 2: Convert to fraction form
    1,187.97/1,780.38 = 638.97/x
  3. Step 3: Cross multiply
    1,187.97x = 1,780.38 × 638.97
  4. Step 4: Simplify right side
    1,187.97x = 1,137,609.41
  5. Step 5: Solve for x
    x = 1,137,609.41/1,187.97
  6. Step 6: Final answer
    x = 957.61

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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.