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Finding the Fourth Proportional to 13,779.55, 20,671.89 and 6,379.12

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Solution

The fourth proportional to 13,779.55, 20,671.89 and 6,379.12 is: 9,569.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,779.55 : 20,671.89 = 6,379.12 : x
  2. Step 2: Convert to fraction form
    13,779.55/20,671.89 = 6,379.12/x
  3. Step 3: Cross multiply
    13,779.55x = 20,671.89 × 6,379.12
  4. Step 4: Simplify right side
    13,779.55x = 131,868,466.94
  5. Step 5: Solve for x
    x = 131,868,466.94/13,779.55
  6. Step 6: Final answer
    x = 9,569.87

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1.5x scale

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.