Home / 13,121.78-18,108.25-7,153.45

Finding the Fourth Proportional to 13,121.78, 18,108.25 and 7,153.45

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Solution

The fourth proportional to 13,121.78, 18,108.25 and 7,153.45 is: 9,871.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.78 : 18,108.25 = 7,153.45 : x
  2. Step 2: Convert to fraction form
    13,121.78/18,108.25 = 7,153.45/x
  3. Step 3: Cross multiply
    13,121.78x = 18,108.25 × 7,153.45
  4. Step 4: Simplify right side
    13,121.78x = 129,536,397.81
  5. Step 5: Solve for x
    x = 129,536,397.81/13,121.78
  6. Step 6: Final answer
    x = 9,871.86

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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.