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Finding the Fourth Proportional to 18,703.56, 28,071.72 and 15,783.96

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Solution

The fourth proportional to 18,703.56, 28,071.72 and 15,783.96 is: 23,689.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,703.56 : 28,071.72 = 15,783.96 : x
  2. Step 2: Convert to fraction form
    18,703.56/28,071.72 = 15,783.96/x
  3. Step 3: Cross multiply
    18,703.56x = 28,071.72 × 15,783.96
  4. Step 4: Simplify right side
    18,703.56x = 443,082,905.61
  5. Step 5: Solve for x
    x = 443,082,905.61/18,703.56
  6. Step 6: Final answer
    x = 23,689.76

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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.