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Finding the Fourth Proportional to 13,586.80, 18,749.80 and 7,618.48

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Solution

The fourth proportional to 13,586.80, 18,749.80 and 7,618.48 is: 10,513.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,586.80 : 18,749.80 = 7,618.48 : x
  2. Step 2: Convert to fraction form
    13,586.80/18,749.80 = 7,618.48/x
  3. Step 3: Cross multiply
    13,586.80x = 18,749.80 × 7,618.48
  4. Step 4: Simplify right side
    13,586.80x = 142,844,976.30
  5. Step 5: Solve for x
    x = 142,844,976.30/13,586.80
  6. Step 6: Final answer
    x = 10,513.51

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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.