Home / 13,779.72-20,666.48-3,918.78

Finding the Fourth Proportional to 13,779.72, 20,666.48 and 3,918.78

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Solution

The fourth proportional to 13,779.72, 20,666.48 and 3,918.78 is: 5,877.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,779.72 : 20,666.48 = 3,918.78 : x
  2. Step 2: Convert to fraction form
    13,779.72/20,666.48 = 3,918.78/x
  3. Step 3: Cross multiply
    13,779.72x = 20,666.48 × 3,918.78
  4. Step 4: Simplify right side
    13,779.72x = 80,987,368.90
  5. Step 5: Solve for x
    x = 80,987,368.90/13,779.72
  6. Step 6: Final answer
    x = 5,877.29

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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.