Home / 13,455.40-20,139.90-10,517.80

Finding the Fourth Proportional to 13,455.40, 20,139.90 and 10,517.80

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Solution

The fourth proportional to 13,455.40, 20,139.90 and 10,517.80 is: 15,742.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,455.40 : 20,139.90 = 10,517.80 : x
  2. Step 2: Convert to fraction form
    13,455.40/20,139.90 = 10,517.80/x
  3. Step 3: Cross multiply
    13,455.40x = 20,139.90 × 10,517.80
  4. Step 4: Simplify right side
    13,455.40x = 211,827,440.22
  5. Step 5: Solve for x
    x = 211,827,440.22/13,455.40
  6. Step 6: Final answer
    x = 15,742.93

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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.