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Finding the Fourth Proportional to 13,609.15, 18,779.18 and 7,641.47

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Solution

The fourth proportional to 13,609.15, 18,779.18 and 7,641.47 is: 10,544.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,609.15 : 18,779.18 = 7,641.47 : x
  2. Step 2: Convert to fraction form
    13,609.15/18,779.18 = 7,641.47/x
  3. Step 3: Cross multiply
    13,609.15x = 18,779.18 × 7,641.47
  4. Step 4: Simplify right side
    13,609.15x = 143,500,549.34
  5. Step 5: Solve for x
    x = 143,500,549.34/13,609.15
  6. Step 6: Final answer
    x = 10,544.42

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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.