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Finding the Fourth Proportional to 1,187.05, 1,780.58 and 537.79

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Solution

The fourth proportional to 1,187.05, 1,780.58 and 537.79 is: 806.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.05 : 1,780.58 = 537.79 : x
  2. Step 2: Convert to fraction form
    1,187.05/1,780.58 = 537.79/x
  3. Step 3: Cross multiply
    1,187.05x = 1,780.58 × 537.79
  4. Step 4: Simplify right side
    1,187.05x = 957,578.12
  5. Step 5: Solve for x
    x = 957,578.12/1,187.05
  6. Step 6: Final answer
    x = 806.69

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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.