Home / 13,420.97-18,519.59-7,835.21

Finding the Fourth Proportional to 13,420.97, 18,519.59 and 7,835.21

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Solution

The fourth proportional to 13,420.97, 18,519.59 and 7,835.21 is: 10,811.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.97 : 18,519.59 = 7,835.21 : x
  2. Step 2: Convert to fraction form
    13,420.97/18,519.59 = 7,835.21/x
  3. Step 3: Cross multiply
    13,420.97x = 18,519.59 × 7,835.21
  4. Step 4: Simplify right side
    13,420.97x = 145,104,837.59
  5. Step 5: Solve for x
    x = 145,104,837.59/13,420.97
  6. Step 6: Final answer
    x = 10,811.80

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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.