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Finding the Fourth Proportional to 18,955.71, 28,410.50 and 13,410.65

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Solution

The fourth proportional to 18,955.71, 28,410.50 and 13,410.65 is: 20,099.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,955.71 : 28,410.50 = 13,410.65 : x
  2. Step 2: Convert to fraction form
    18,955.71/28,410.50 = 13,410.65/x
  3. Step 3: Cross multiply
    18,955.71x = 28,410.50 × 13,410.65
  4. Step 4: Simplify right side
    18,955.71x = 381,003,204.77
  5. Step 5: Solve for x
    x = 381,003,204.77/18,955.71
  6. Step 6: Final answer
    x = 20,099.65

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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.