Home / 13,728.39-18,945.19-7,440.76

Finding the Fourth Proportional to 13,728.39, 18,945.19 and 7,440.76

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Solution

The fourth proportional to 13,728.39, 18,945.19 and 7,440.76 is: 10,268.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,728.39 : 18,945.19 = 7,440.76 : x
  2. Step 2: Convert to fraction form
    13,728.39/18,945.19 = 7,440.76/x
  3. Step 3: Cross multiply
    13,728.39x = 18,945.19 × 7,440.76
  4. Step 4: Simplify right side
    13,728.39x = 140,966,611.94
  5. Step 5: Solve for x
    x = 140,966,611.94/13,728.39
  6. Step 6: Final answer
    x = 10,268.26

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Half scale
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Double scale
Find fourth proportional to 13,729.39, 18,946.57 and 7,441.76
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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.