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Finding the Fourth Proportional to 18,966.70, 28,409.01 and 12,372.85

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Solution

The fourth proportional to 18,966.70, 28,409.01 and 12,372.85 is: 18,532.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,966.70 : 28,409.01 = 12,372.85 : x
  2. Step 2: Convert to fraction form
    18,966.70/28,409.01 = 12,372.85/x
  3. Step 3: Cross multiply
    18,966.70x = 28,409.01 × 12,372.85
  4. Step 4: Simplify right side
    18,966.70x = 351,500,419.38
  5. Step 5: Solve for x
    x = 351,500,419.38/18,966.70
  6. Step 6: Final answer
    x = 18,532.50

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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.