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Finding the Fourth Proportional to 7,186.32, 10,779.40 and 1,992

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Solution

The fourth proportional to 7,186.32, 10,779.40 and 1,992 is: 2,987.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,186.32 : 10,779.40 = 1,992 : x
  2. Step 2: Convert to fraction form
    7,186.32/10,779.40 = 1,992/x
  3. Step 3: Cross multiply
    7,186.32x = 10,779.40 × 1,992
  4. Step 4: Simplify right side
    7,186.32x = 21,472,564.80
  5. Step 5: Solve for x
    x = 21,472,564.80/7,186.32
  6. Step 6: Final answer
    x = 2,987.98

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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.