Home / 13,121.76-18,108.48-7,153.68

Finding the Fourth Proportional to 13,121.76, 18,108.48 and 7,153.68

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Solution

The fourth proportional to 13,121.76, 18,108.48 and 7,153.68 is: 9,872.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.76 : 18,108.48 = 7,153.68 : x
  2. Step 2: Convert to fraction form
    13,121.76/18,108.48 = 7,153.68/x
  3. Step 3: Cross multiply
    13,121.76x = 18,108.48 × 7,153.68
  4. Step 4: Simplify right side
    13,121.76x = 129,542,271.21
  5. Step 5: Solve for x
    x = 129,542,271.21/13,121.76
  6. Step 6: Final answer
    x = 9,872.32

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Half scale
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Double scale
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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.