Home / 13,121.98-18,108.36-7,153.63

Finding the Fourth Proportional to 13,121.98, 18,108.36 and 7,153.63

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Solution

The fourth proportional to 13,121.98, 18,108.36 and 7,153.63 is: 9,872.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.98 : 18,108.36 = 7,153.63 : x
  2. Step 2: Convert to fraction form
    13,121.98/18,108.36 = 7,153.63/x
  3. Step 3: Cross multiply
    13,121.98x = 18,108.36 × 7,153.63
  4. Step 4: Simplify right side
    13,121.98x = 129,540,507.35
  5. Step 5: Solve for x
    x = 129,540,507.35/13,121.98
  6. Step 6: Final answer
    x = 9,872.02

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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.