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Finding the Fourth Proportional to 9,939.40, 13,694.74 and 7,420.52

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Solution

The fourth proportional to 9,939.40, 13,694.74 and 7,420.52 is: 10,224.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,939.40 : 13,694.74 = 7,420.52 : x
  2. Step 2: Convert to fraction form
    9,939.40/13,694.74 = 7,420.52/x
  3. Step 3: Cross multiply
    9,939.40x = 13,694.74 × 7,420.52
  4. Step 4: Simplify right side
    9,939.40x = 101,622,092.06
  5. Step 5: Solve for x
    x = 101,622,092.06/9,939.40
  6. Step 6: Final answer
    x = 10,224.17

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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.