Home / 13,478.72-20,221.74-7,639.43

Finding the Fourth Proportional to 13,478.72, 20,221.74 and 7,639.43

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Solution

The fourth proportional to 13,478.72, 20,221.74 and 7,639.43 is: 11,461.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,478.72 : 20,221.74 = 7,639.43 : x
  2. Step 2: Convert to fraction form
    13,478.72/20,221.74 = 7,639.43/x
  3. Step 3: Cross multiply
    13,478.72x = 20,221.74 × 7,639.43
  4. Step 4: Simplify right side
    13,478.72x = 154,482,567.21
  5. Step 5: Solve for x
    x = 154,482,567.21/13,478.72
  6. Step 6: Final answer
    x = 11,461.22

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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.