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Finding the Fourth Proportional to 18,993.22, 28,447.00 and 9,139.87

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Solution

The fourth proportional to 18,993.22, 28,447.00 and 9,139.87 is: 13,689.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,993.22 : 28,447.00 = 9,139.87 : x
  2. Step 2: Convert to fraction form
    18,993.22/28,447.00 = 9,139.87/x
  3. Step 3: Cross multiply
    18,993.22x = 28,447.00 × 9,139.87
  4. Step 4: Simplify right side
    18,993.22x = 260,001,894.60
  5. Step 5: Solve for x
    x = 260,001,894.60/18,993.22
  6. Step 6: Final answer
    x = 13,689.20

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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.