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Finding the Fourth Proportional to 13,572.36, 18,720.72 and 7,983.36

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Solution

The fourth proportional to 13,572.36, 18,720.72 and 7,983.36 is: 11,011.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,572.36 : 18,720.72 = 7,983.36 : x
  2. Step 2: Convert to fraction form
    13,572.36/18,720.72 = 7,983.36/x
  3. Step 3: Cross multiply
    13,572.36x = 18,720.72 × 7,983.36
  4. Step 4: Simplify right side
    13,572.36x = 149,454,247.22
  5. Step 5: Solve for x
    x = 149,454,247.22/13,572.36
  6. Step 6: Final answer
    x = 11,011.66

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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.