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Finding the Fourth Proportional to 7,129.74, 9,839.07 and 4,147.32

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Solution

The fourth proportional to 7,129.74, 9,839.07 and 4,147.32 is: 5,723.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.74 : 9,839.07 = 4,147.32 : x
  2. Step 2: Convert to fraction form
    7,129.74/9,839.07 = 4,147.32/x
  3. Step 3: Cross multiply
    7,129.74x = 9,839.07 × 4,147.32
  4. Step 4: Simplify right side
    7,129.74x = 40,805,771.79
  5. Step 5: Solve for x
    x = 40,805,771.79/7,129.74
  6. Step 6: Final answer
    x = 5,723.32

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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.