Home / 13,385.68-20,081.58-7,142.40

Finding the Fourth Proportional to 13,385.68, 20,081.58 and 7,142.40

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Solution

The fourth proportional to 13,385.68, 20,081.58 and 7,142.40 is: 10,715.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,385.68 : 20,081.58 = 7,142.40 : x
  2. Step 2: Convert to fraction form
    13,385.68/20,081.58 = 7,142.40/x
  3. Step 3: Cross multiply
    13,385.68x = 20,081.58 × 7,142.40
  4. Step 4: Simplify right side
    13,385.68x = 143,430,676.99
  5. Step 5: Solve for x
    x = 143,430,676.99/13,385.68
  6. Step 6: Final answer
    x = 10,715.23

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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.