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Finding the Fourth Proportional to 13,138.28, 18,130.12 and 7,472.28

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Solution

The fourth proportional to 13,138.28, 18,130.12 and 7,472.28 is: 10,311.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.28 : 18,130.12 = 7,472.28 : x
  2. Step 2: Convert to fraction form
    13,138.28/18,130.12 = 7,472.28/x
  3. Step 3: Cross multiply
    13,138.28x = 18,130.12 × 7,472.28
  4. Step 4: Simplify right side
    13,138.28x = 135,473,333.07
  5. Step 5: Solve for x
    x = 135,473,333.07/13,138.28
  6. Step 6: Final answer
    x = 10,311.34

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Double scale
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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.