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Finding the Fourth Proportional to 31,638.72, 43,654.18 and 18,889.42

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Solution

The fourth proportional to 31,638.72, 43,654.18 and 18,889.42 is: 26,063.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,638.72 : 43,654.18 = 18,889.42 : x
  2. Step 2: Convert to fraction form
    31,638.72/43,654.18 = 18,889.42/x
  3. Step 3: Cross multiply
    31,638.72x = 43,654.18 × 18,889.42
  4. Step 4: Simplify right side
    31,638.72x = 824,602,140.78
  5. Step 5: Solve for x
    x = 824,602,140.78/31,638.72
  6. Step 6: Final answer
    x = 26,063.07

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.