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Finding the Fourth Proportional to 71,245.55, 106,865.28 and 18,653.87

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Solution

The fourth proportional to 71,245.55, 106,865.28 and 18,653.87 is: 27,980.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,245.55 : 106,865.28 = 18,653.87 : x
  2. Step 2: Convert to fraction form
    71,245.55/106,865.28 = 18,653.87/x
  3. Step 3: Cross multiply
    71,245.55x = 106,865.28 × 18,653.87
  4. Step 4: Simplify right side
    71,245.55x = 1,993,450,506.31
  5. Step 5: Solve for x
    x = 1,993,450,506.31/71,245.55
  6. Step 6: Final answer
    x = 27,980.00

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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.