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Finding the Fourth Proportional to 18,810.96, 28,204.64 and 12,960.96

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Solution

The fourth proportional to 18,810.96, 28,204.64 and 12,960.96 is: 19,433.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,810.96 : 28,204.64 = 12,960.96 : x
  2. Step 2: Convert to fraction form
    18,810.96/28,204.64 = 12,960.96/x
  3. Step 3: Cross multiply
    18,810.96x = 28,204.64 × 12,960.96
  4. Step 4: Simplify right side
    18,810.96x = 365,559,210.85
  5. Step 5: Solve for x
    x = 365,559,210.85/18,810.96
  6. Step 6: Final answer
    x = 19,433.31

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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.