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Finding the Fourth Proportional to 8,489.70, 12,734.55 and 7,128.90

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Solution

The fourth proportional to 8,489.70, 12,734.55 and 7,128.90 is: 10,693.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,489.70 : 12,734.55 = 7,128.90 : x
  2. Step 2: Convert to fraction form
    8,489.70/12,734.55 = 7,128.90/x
  3. Step 3: Cross multiply
    8,489.70x = 12,734.55 × 7,128.90
  4. Step 4: Simplify right side
    8,489.70x = 90,783,333.50
  5. Step 5: Solve for x
    x = 90,783,333.50/8,489.70
  6. Step 6: Final answer
    x = 10,693.35

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.