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Finding the Fourth Proportional to 18,980.82, 28,477.32 and 9,120.81

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Solution

The fourth proportional to 18,980.82, 28,477.32 and 9,120.81 is: 13,684.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,980.82 : 28,477.32 = 9,120.81 : x
  2. Step 2: Convert to fraction form
    18,980.82/28,477.32 = 9,120.81/x
  3. Step 3: Cross multiply
    18,980.82x = 28,477.32 × 9,120.81
  4. Step 4: Simplify right side
    18,980.82x = 259,736,225.03
  5. Step 5: Solve for x
    x = 259,736,225.03/18,980.82
  6. Step 6: Final answer
    x = 13,684.14

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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.