Home / 12,720.18-17,553.74-7,131.18

Finding the Fourth Proportional to 12,720.18, 17,553.74 and 7,131.18

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Solution

The fourth proportional to 12,720.18, 17,553.74 and 7,131.18 is: 9,840.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720.18 : 17,553.74 = 7,131.18 : x
  2. Step 2: Convert to fraction form
    12,720.18/17,553.74 = 7,131.18/x
  3. Step 3: Cross multiply
    12,720.18x = 17,553.74 × 7,131.18
  4. Step 4: Simplify right side
    12,720.18x = 125,178,843.96
  5. Step 5: Solve for x
    x = 125,178,843.96/12,720.18
  6. Step 6: Final answer
    x = 9,840.96

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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.