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Finding the Fourth Proportional to 10,912.60, 16,385.10 and 7,640.20

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Solution

The fourth proportional to 10,912.60, 16,385.10 and 7,640.20 is: 11,471.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,912.60 : 16,385.10 = 7,640.20 : x
  2. Step 2: Convert to fraction form
    10,912.60/16,385.10 = 7,640.20/x
  3. Step 3: Cross multiply
    10,912.60x = 16,385.10 × 7,640.20
  4. Step 4: Simplify right side
    10,912.60x = 125,185,441.02
  5. Step 5: Solve for x
    x = 125,185,441.02/10,912.60
  6. Step 6: Final answer
    x = 11,471.64

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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.