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Finding the Fourth Proportional to 68,129.80, 102,090.60 and 28,665.28

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Solution

The fourth proportional to 68,129.80, 102,090.60 and 28,665.28 is: 42,954.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,129.80 : 102,090.60 = 28,665.28 : x
  2. Step 2: Convert to fraction form
    68,129.80/102,090.60 = 28,665.28/x
  3. Step 3: Cross multiply
    68,129.80x = 102,090.60 × 28,665.28
  4. Step 4: Simplify right side
    68,129.80x = 2,926,455,634.37
  5. Step 5: Solve for x
    x = 2,926,455,634.37/68,129.80
  6. Step 6: Final answer
    x = 42,954.12

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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.