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Finding the Fourth Proportional to 13,609.59, 18,779.94 and 7,640.09

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Solution

The fourth proportional to 13,609.59, 18,779.94 and 7,640.09 is: 10,542.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,609.59 : 18,779.94 = 7,640.09 : x
  2. Step 2: Convert to fraction form
    13,609.59/18,779.94 = 7,640.09/x
  3. Step 3: Cross multiply
    13,609.59x = 18,779.94 × 7,640.09
  4. Step 4: Simplify right side
    13,609.59x = 143,480,337.89
  5. Step 5: Solve for x
    x = 143,480,337.89/13,609.59
  6. Step 6: Final answer
    x = 10,542.59

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1.5x scale

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.