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Finding the Fourth Proportional to 13,138.56, 18,129.42 and 7,549.56

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Solution

The fourth proportional to 13,138.56, 18,129.42 and 7,549.56 is: 10,417.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.56 : 18,129.42 = 7,549.56 : x
  2. Step 2: Convert to fraction form
    13,138.56/18,129.42 = 7,549.56/x
  3. Step 3: Cross multiply
    13,138.56x = 18,129.42 × 7,549.56
  4. Step 4: Simplify right side
    13,138.56x = 136,869,144.06
  5. Step 5: Solve for x
    x = 136,869,144.06/13,138.56
  6. Step 6: Final answer
    x = 10,417.36

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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.