Home / 1,188.12-1,635.90-1,039.86

Finding the Fourth Proportional to 1,188.12, 1,635.90 and 1,039.86

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Solution

The fourth proportional to 1,188.12, 1,635.90 and 1,039.86 is: 1,431.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.12 : 1,635.90 = 1,039.86 : x
  2. Step 2: Convert to fraction form
    1,188.12/1,635.90 = 1,039.86/x
  3. Step 3: Cross multiply
    1,188.12x = 1,635.90 × 1,039.86
  4. Step 4: Simplify right side
    1,188.12x = 1,701,106.97
  5. Step 5: Solve for x
    x = 1,701,106.97/1,188.12
  6. Step 6: Final answer
    x = 1,431.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.