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Finding the Fourth Proportional to 1,187.14, 1,780.47 and 365.19

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Solution

The fourth proportional to 1,187.14, 1,780.47 and 365.19 is: 547.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.14 : 1,780.47 = 365.19 : x
  2. Step 2: Convert to fraction form
    1,187.14/1,780.47 = 365.19/x
  3. Step 3: Cross multiply
    1,187.14x = 1,780.47 × 365.19
  4. Step 4: Simplify right side
    1,187.14x = 650,200.94
  5. Step 5: Solve for x
    x = 650,200.94/1,187.14
  6. Step 6: Final answer
    x = 547.71

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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.