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Finding the Fourth Proportional to 28,940.20, 43,412.70 and 9,218.20

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Solution

The fourth proportional to 28,940.20, 43,412.70 and 9,218.20 is: 13,828.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,940.20 : 43,412.70 = 9,218.20 : x
  2. Step 2: Convert to fraction form
    28,940.20/43,412.70 = 9,218.20/x
  3. Step 3: Cross multiply
    28,940.20x = 43,412.70 × 9,218.20
  4. Step 4: Simplify right side
    28,940.20x = 400,186,951.14
  5. Step 5: Solve for x
    x = 400,186,951.14/28,940.20
  6. Step 6: Final answer
    x = 13,828.06

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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.