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Finding the Fourth Proportional to 7,043.68, 9,720.28 and 3,899.87

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Solution

The fourth proportional to 7,043.68, 9,720.28 and 3,899.87 is: 5,381.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,043.68 : 9,720.28 = 3,899.87 : x
  2. Step 2: Convert to fraction form
    7,043.68/9,720.28 = 3,899.87/x
  3. Step 3: Cross multiply
    7,043.68x = 9,720.28 × 3,899.87
  4. Step 4: Simplify right side
    7,043.68x = 37,907,763.61
  5. Step 5: Solve for x
    x = 37,907,763.61/7,043.68
  6. Step 6: Final answer
    x = 5,381.81

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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.