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Finding the Fourth Proportional to 18,956.57, 28,411.79 and 13,411.51

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Solution

The fourth proportional to 18,956.57, 28,411.79 and 13,411.51 is: 20,100.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,956.57 : 28,411.79 = 13,411.51 : x
  2. Step 2: Convert to fraction form
    18,956.57/28,411.79 = 13,411.51/x
  3. Step 3: Cross multiply
    18,956.57x = 28,411.79 × 13,411.51
  4. Step 4: Simplify right side
    18,956.57x = 381,044,905.34
  5. Step 5: Solve for x
    x = 381,044,905.34/18,956.57
  6. Step 6: Final answer
    x = 20,100.95

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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.