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Finding the Fourth Proportional to 18,681.31, 28,019.03 and 5,169.29

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Solution

The fourth proportional to 18,681.31, 28,019.03 and 5,169.29 is: 7,753.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,681.31 : 28,019.03 = 5,169.29 : x
  2. Step 2: Convert to fraction form
    18,681.31/28,019.03 = 5,169.29/x
  3. Step 3: Cross multiply
    18,681.31x = 28,019.03 × 5,169.29
  4. Step 4: Simplify right side
    18,681.31x = 144,838,535.79
  5. Step 5: Solve for x
    x = 144,838,535.79/18,681.31
  6. Step 6: Final answer
    x = 7,753.13

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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.