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Finding the Fourth Proportional to 13,609.58, 18,779.91 and 7,639.88

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Solution

The fourth proportional to 13,609.58, 18,779.91 and 7,639.88 is: 10,542.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,609.58 : 18,779.91 = 7,639.88 : x
  2. Step 2: Convert to fraction form
    13,609.58/18,779.91 = 7,639.88/x
  3. Step 3: Cross multiply
    13,609.58x = 18,779.91 × 7,639.88
  4. Step 4: Simplify right side
    13,609.58x = 143,476,164.91
  5. Step 5: Solve for x
    x = 143,476,164.91/13,609.58
  6. Step 6: Final answer
    x = 10,542.30

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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.