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Finding the Fourth Proportional to 7,043.60, 9,720.06 and 3,899.90

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Solution

The fourth proportional to 7,043.60, 9,720.06 and 3,899.90 is: 5,381.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,043.60 : 9,720.06 = 3,899.90 : x
  2. Step 2: Convert to fraction form
    7,043.60/9,720.06 = 3,899.90/x
  3. Step 3: Cross multiply
    7,043.60x = 9,720.06 × 3,899.90
  4. Step 4: Simplify right side
    7,043.60x = 37,907,261.99
  5. Step 5: Solve for x
    x = 37,907,261.99/7,043.60
  6. Step 6: Final answer
    x = 5,381.80

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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.