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Finding the Fourth Proportional to 1,186.92, 1,780.72 and 1,039.30

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Solution

The fourth proportional to 1,186.92, 1,780.72 and 1,039.30 is: 1,559.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.92 : 1,780.72 = 1,039.30 : x
  2. Step 2: Convert to fraction form
    1,186.92/1,780.72 = 1,039.30/x
  3. Step 3: Cross multiply
    1,186.92x = 1,780.72 × 1,039.30
  4. Step 4: Simplify right side
    1,186.92x = 1,850,695.25
  5. Step 5: Solve for x
    x = 1,850,695.25/1,186.92
  6. Step 6: Final answer
    x = 1,559.24

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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.