Home / 13,121.80-18,107.55-7,153.11

Finding the Fourth Proportional to 13,121.80, 18,107.55 and 7,153.11

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Solution

The fourth proportional to 13,121.80, 18,107.55 and 7,153.11 is: 9,871.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.80 : 18,107.55 = 7,153.11 : x
  2. Step 2: Convert to fraction form
    13,121.80/18,107.55 = 7,153.11/x
  3. Step 3: Cross multiply
    13,121.80x = 18,107.55 × 7,153.11
  4. Step 4: Simplify right side
    13,121.80x = 129,525,296.98
  5. Step 5: Solve for x
    x = 129,525,296.98/13,121.80
  6. Step 6: Final answer
    x = 9,871.00

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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.