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Finding the Fourth Proportional to 18,558.45, 27,829.78 and 7,158.51

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Solution

The fourth proportional to 18,558.45, 27,829.78 and 7,158.51 is: 10,734.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,558.45 : 27,829.78 = 7,158.51 : x
  2. Step 2: Convert to fraction form
    18,558.45/27,829.78 = 7,158.51/x
  3. Step 3: Cross multiply
    18,558.45x = 27,829.78 × 7,158.51
  4. Step 4: Simplify right side
    18,558.45x = 199,219,740.53
  5. Step 5: Solve for x
    x = 199,219,740.53/18,558.45
  6. Step 6: Final answer
    x = 10,734.72

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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.