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Finding the Fourth Proportional to 28,935.60, 43,405.80 and 9,213.60

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Solution

The fourth proportional to 28,935.60, 43,405.80 and 9,213.60 is: 13,821.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,935.60 : 43,405.80 = 9,213.60 : x
  2. Step 2: Convert to fraction form
    28,935.60/43,405.80 = 9,213.60/x
  3. Step 3: Cross multiply
    28,935.60x = 43,405.80 × 9,213.60
  4. Step 4: Simplify right side
    28,935.60x = 399,923,678.88
  5. Step 5: Solve for x
    x = 399,923,678.88/28,935.60
  6. Step 6: Final answer
    x = 13,821.16

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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.