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Finding the Fourth Proportional to 20,874.79, 28,808.39 and 12,381.94

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Solution

The fourth proportional to 20,874.79, 28,808.39 and 12,381.94 is: 17,087.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,874.79 : 28,808.39 = 12,381.94 : x
  2. Step 2: Convert to fraction form
    20,874.79/28,808.39 = 12,381.94/x
  3. Step 3: Cross multiply
    20,874.79x = 28,808.39 × 12,381.94
  4. Step 4: Simplify right side
    20,874.79x = 356,703,756.48
  5. Step 5: Solve for x
    x = 356,703,756.48/20,874.79
  6. Step 6: Final answer
    x = 17,087.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.