Home / 13,142.80-18,137.10-7,174.47

Finding the Fourth Proportional to 13,142.80, 18,137.10 and 7,174.47

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Solution

The fourth proportional to 13,142.80, 18,137.10 and 7,174.47 is: 9,900.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,142.80 : 18,137.10 = 7,174.47 : x
  2. Step 2: Convert to fraction form
    13,142.80/18,137.10 = 7,174.47/x
  3. Step 3: Cross multiply
    13,142.80x = 18,137.10 × 7,174.47
  4. Step 4: Simplify right side
    13,142.80x = 130,124,147.85
  5. Step 5: Solve for x
    x = 130,124,147.85/13,142.80
  6. Step 6: Final answer
    x = 9,900.79

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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.