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Finding the Fourth Proportional to 1,187.43, 1,779.78 and 775.86

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Solution

The fourth proportional to 1,187.43, 1,779.78 and 775.86 is: 1,162.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.43 : 1,779.78 = 775.86 : x
  2. Step 2: Convert to fraction form
    1,187.43/1,779.78 = 775.86/x
  3. Step 3: Cross multiply
    1,187.43x = 1,779.78 × 775.86
  4. Step 4: Simplify right side
    1,187.43x = 1,380,860.11
  5. Step 5: Solve for x
    x = 1,380,860.11/1,187.43
  6. Step 6: Final answer
    x = 1,162.90

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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.