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Finding the Fourth Proportional to 18,956.82, 28,412.16 and 13,411.76

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Solution

The fourth proportional to 18,956.82, 28,412.16 and 13,411.76 is: 20,101.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,956.82 : 28,412.16 = 13,411.76 : x
  2. Step 2: Convert to fraction form
    18,956.82/28,412.16 = 13,411.76/x
  3. Step 3: Cross multiply
    18,956.82x = 28,412.16 × 13,411.76
  4. Step 4: Simplify right side
    18,956.82x = 381,057,071.00
  5. Step 5: Solve for x
    x = 381,057,071.00/18,956.82
  6. Step 6: Final answer
    x = 20,101.32

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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.