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Finding the Fourth Proportional to 9,128.70, 13,693.05 and 8,472.60

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Solution

The fourth proportional to 9,128.70, 13,693.05 and 8,472.60 is: 12,708.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,128.70 : 13,693.05 = 8,472.60 : x
  2. Step 2: Convert to fraction form
    9,128.70/13,693.05 = 8,472.60/x
  3. Step 3: Cross multiply
    9,128.70x = 13,693.05 × 8,472.60
  4. Step 4: Simplify right side
    9,128.70x = 116,015,735.43
  5. Step 5: Solve for x
    x = 116,015,735.43/9,128.70
  6. Step 6: Final answer
    x = 12,708.90

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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.