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Finding the Fourth Proportional to 7,129.64, 9,839.82 and 3,986

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Solution

The fourth proportional to 7,129.64, 9,839.82 and 3,986 is: 5,501.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.64 : 9,839.82 = 3,986 : x
  2. Step 2: Convert to fraction form
    7,129.64/9,839.82 = 3,986/x
  3. Step 3: Cross multiply
    7,129.64x = 9,839.82 × 3,986
  4. Step 4: Simplify right side
    7,129.64x = 39,221,522.52
  5. Step 5: Solve for x
    x = 39,221,522.52/7,129.64
  6. Step 6: Final answer
    x = 5,501.19

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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.