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Finding the Fourth Proportional to 3,987.85, 5,980.86 and 1,175.96

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Solution

The fourth proportional to 3,987.85, 5,980.86 and 1,175.96 is: 1,763.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.85 : 5,980.86 = 1,175.96 : x
  2. Step 2: Convert to fraction form
    3,987.85/5,980.86 = 1,175.96/x
  3. Step 3: Cross multiply
    3,987.85x = 5,980.86 × 1,175.96
  4. Step 4: Simplify right side
    3,987.85x = 7,033,252.13
  5. Step 5: Solve for x
    x = 7,033,252.13/3,987.85
  6. Step 6: Final answer
    x = 1,763.67

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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.