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Finding the Fourth Proportional to 10,912.80, 16,385.40 and 8,450.40

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Solution

The fourth proportional to 10,912.80, 16,385.40 and 8,450.40 is: 12,688.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,912.80 : 16,385.40 = 8,450.40 : x
  2. Step 2: Convert to fraction form
    10,912.80/16,385.40 = 8,450.40/x
  3. Step 3: Cross multiply
    10,912.80x = 16,385.40 × 8,450.40
  4. Step 4: Simplify right side
    10,912.80x = 138,463,184.16
  5. Step 5: Solve for x
    x = 138,463,184.16/10,912.80
  6. Step 6: Final answer
    x = 12,688.14

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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.