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Finding the Fourth Proportional to 28,752.62, 43,128.54 and 7,405.21

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Solution

The fourth proportional to 28,752.62, 43,128.54 and 7,405.21 is: 11,107.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,752.62 : 43,128.54 = 7,405.21 : x
  2. Step 2: Convert to fraction form
    28,752.62/43,128.54 = 7,405.21/x
  3. Step 3: Cross multiply
    28,752.62x = 43,128.54 × 7,405.21
  4. Step 4: Simplify right side
    28,752.62x = 319,375,858.67
  5. Step 5: Solve for x
    x = 319,375,858.67/28,752.62
  6. Step 6: Final answer
    x = 11,107.72

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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.