Home / 13,121.91-18,108.18-7,153.56

Finding the Fourth Proportional to 13,121.91, 18,108.18 and 7,153.56

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Solution

The fourth proportional to 13,121.91, 18,108.18 and 7,153.56 is: 9,871.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.91 : 18,108.18 = 7,153.56 : x
  2. Step 2: Convert to fraction form
    13,121.91/18,108.18 = 7,153.56/x
  3. Step 3: Cross multiply
    13,121.91x = 18,108.18 × 7,153.56
  4. Step 4: Simplify right side
    13,121.91x = 129,537,952.12
  5. Step 5: Solve for x
    x = 129,537,952.12/13,121.91
  6. Step 6: Final answer
    x = 9,871.88

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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.