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Finding the Fourth Proportional to 7,043.32, 9,720.08 and 3,899.50

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Solution

The fourth proportional to 7,043.32, 9,720.08 and 3,899.50 is: 5,381.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,043.32 : 9,720.08 = 3,899.50 : x
  2. Step 2: Convert to fraction form
    7,043.32/9,720.08 = 3,899.50/x
  3. Step 3: Cross multiply
    7,043.32x = 9,720.08 × 3,899.50
  4. Step 4: Simplify right side
    7,043.32x = 37,903,451.96
  5. Step 5: Solve for x
    x = 37,903,451.96/7,043.32
  6. Step 6: Final answer
    x = 5,381.48

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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.