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Finding the Fourth Proportional to 18,855.53, 28,282.69 and 4,815.51

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Solution

The fourth proportional to 18,855.53, 28,282.69 and 4,815.51 is: 7,223.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,855.53 : 28,282.69 = 4,815.51 : x
  2. Step 2: Convert to fraction form
    18,855.53/28,282.69 = 4,815.51/x
  3. Step 3: Cross multiply
    18,855.53x = 28,282.69 × 4,815.51
  4. Step 4: Simplify right side
    18,855.53x = 136,195,576.52
  5. Step 5: Solve for x
    x = 136,195,576.52/18,855.53
  6. Step 6: Final answer
    x = 7,223.11

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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.