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Finding the Fourth Proportional to 7,139.88, 9,852.66 and 3,909.61

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Solution

The fourth proportional to 7,139.88, 9,852.66 and 3,909.61 is: 5,395.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,139.88 : 9,852.66 = 3,909.61 : x
  2. Step 2: Convert to fraction form
    7,139.88/9,852.66 = 3,909.61/x
  3. Step 3: Cross multiply
    7,139.88x = 9,852.66 × 3,909.61
  4. Step 4: Simplify right side
    7,139.88x = 38,520,048.09
  5. Step 5: Solve for x
    x = 38,520,048.09/7,139.88
  6. Step 6: Final answer
    x = 5,395.06

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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.