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Finding the Fourth Proportional to 18,979.31, 28,475.06 and 9,119.31

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Solution

The fourth proportional to 18,979.31, 28,475.06 and 9,119.31 is: 13,681.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.31 : 28,475.06 = 9,119.31 : x
  2. Step 2: Convert to fraction form
    18,979.31/28,475.06 = 9,119.31/x
  3. Step 3: Cross multiply
    18,979.31x = 28,475.06 × 9,119.31
  4. Step 4: Simplify right side
    18,979.31x = 259,672,853.81
  5. Step 5: Solve for x
    x = 259,672,853.81/18,979.31
  6. Step 6: Final answer
    x = 13,681.89

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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.