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Finding the Fourth Proportional to 7,043.76, 9,720.39 and 3,899.88

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Solution

The fourth proportional to 7,043.76, 9,720.39 and 3,899.88 is: 5,381.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,043.76 : 9,720.39 = 3,899.88 : x
  2. Step 2: Convert to fraction form
    7,043.76/9,720.39 = 3,899.88/x
  3. Step 3: Cross multiply
    7,043.76x = 9,720.39 × 3,899.88
  4. Step 4: Simplify right side
    7,043.76x = 37,908,354.55
  5. Step 5: Solve for x
    x = 37,908,354.55/7,043.76
  6. Step 6: Final answer
    x = 5,381.84

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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.