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Finding the Fourth Proportional to 18,720.98, 28,078.28 and 6,239.69

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Solution

The fourth proportional to 18,720.98, 28,078.28 and 6,239.69 is: 9,358.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.98 : 28,078.28 = 6,239.69 : x
  2. Step 2: Convert to fraction form
    18,720.98/28,078.28 = 6,239.69/x
  3. Step 3: Cross multiply
    18,720.98x = 28,078.28 × 6,239.69
  4. Step 4: Simplify right side
    18,720.98x = 175,199,720.04
  5. Step 5: Solve for x
    x = 175,199,720.04/18,720.98
  6. Step 6: Final answer
    x = 9,358.47

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.