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Finding the Fourth Proportional to 18,875.76, 28,252.03 and 13,876.81

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Solution

The fourth proportional to 18,875.76, 28,252.03 and 13,876.81 is: 20,769.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,875.76 : 28,252.03 = 13,876.81 : x
  2. Step 2: Convert to fraction form
    18,875.76/28,252.03 = 13,876.81/x
  3. Step 3: Cross multiply
    18,875.76x = 28,252.03 × 13,876.81
  4. Step 4: Simplify right side
    18,875.76x = 392,048,016.69
  5. Step 5: Solve for x
    x = 392,048,016.69/18,875.76
  6. Step 6: Final answer
    x = 20,769.92

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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.