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Finding the Fourth Proportional to 13,391.96, 18,480.71 and 7,726.71

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Solution

The fourth proportional to 13,391.96, 18,480.71 and 7,726.71 is: 10,662.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,391.96 : 18,480.71 = 7,726.71 : x
  2. Step 2: Convert to fraction form
    13,391.96/18,480.71 = 7,726.71/x
  3. Step 3: Cross multiply
    13,391.96x = 18,480.71 × 7,726.71
  4. Step 4: Simplify right side
    13,391.96x = 142,795,048.13
  5. Step 5: Solve for x
    x = 142,795,048.13/13,391.96
  6. Step 6: Final answer
    x = 10,662.75

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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.