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Finding the Fourth Proportional to 13,579.61, 18,741 and 7,914.81

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Solution

The fourth proportional to 13,579.61, 18,741 and 7,914.81 is: 10,923.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,579.61 : 18,741 = 7,914.81 : x
  2. Step 2: Convert to fraction form
    13,579.61/18,741 = 7,914.81/x
  3. Step 3: Cross multiply
    13,579.61x = 18,741 × 7,914.81
  4. Step 4: Simplify right side
    13,579.61x = 148,331,454.21
  5. Step 5: Solve for x
    x = 148,331,454.21/13,579.61
  6. Step 6: Final answer
    x = 10,923.11

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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.