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Finding the Fourth Proportional to 1,187.09, 1,780.65 and 456.27

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Solution

The fourth proportional to 1,187.09, 1,780.65 and 456.27 is: 684.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.09 : 1,780.65 = 456.27 : x
  2. Step 2: Convert to fraction form
    1,187.09/1,780.65 = 456.27/x
  3. Step 3: Cross multiply
    1,187.09x = 1,780.65 × 456.27
  4. Step 4: Simplify right side
    1,187.09x = 812,450.50
  5. Step 5: Solve for x
    x = 812,450.50/1,187.09
  6. Step 6: Final answer
    x = 684.41

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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.