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Finding the Fourth Proportional to 7,170.71, 9,895.70 and 3,984.30

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Solution

The fourth proportional to 7,170.71, 9,895.70 and 3,984.30 is: 5,498.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,170.71 : 9,895.70 = 3,984.30 : x
  2. Step 2: Convert to fraction form
    7,170.71/9,895.70 = 3,984.30/x
  3. Step 3: Cross multiply
    7,170.71x = 9,895.70 × 3,984.30
  4. Step 4: Simplify right side
    7,170.71x = 39,427,388.03
  5. Step 5: Solve for x
    x = 39,427,388.03/7,170.71
  6. Step 6: Final answer
    x = 5,498.40

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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.