Home / 13,609.40-18,779.67-7,639.92

Finding the Fourth Proportional to 13,609.40, 18,779.67 and 7,639.92

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Solution

The fourth proportional to 13,609.40, 18,779.67 and 7,639.92 is: 10,542.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,609.40 : 18,779.67 = 7,639.92 : x
  2. Step 2: Convert to fraction form
    13,609.40/18,779.67 = 7,639.92/x
  3. Step 3: Cross multiply
    13,609.40x = 18,779.67 × 7,639.92
  4. Step 4: Simplify right side
    13,609.40x = 143,475,176.43
  5. Step 5: Solve for x
    x = 143,475,176.43/13,609.40
  6. Step 6: Final answer
    x = 10,542.36

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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.