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Finding the Fourth Proportional to 9,939.48, 13,721.28 and 9,138.88

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Solution

The fourth proportional to 9,939.48, 13,721.28 and 9,138.88 is: 12,616.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,939.48 : 13,721.28 = 9,138.88 : x
  2. Step 2: Convert to fraction form
    9,939.48/13,721.28 = 9,138.88/x
  3. Step 3: Cross multiply
    9,939.48x = 13,721.28 × 9,138.88
  4. Step 4: Simplify right side
    9,939.48x = 125,397,131.37
  5. Step 5: Solve for x
    x = 125,397,131.37/9,939.48
  6. Step 6: Final answer
    x = 12,616.07

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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.