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Finding the Fourth Proportional to 154,857.45, 213,719.46 and 86,892.78

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Solution

The fourth proportional to 154,857.45, 213,719.46 and 86,892.78 is: 119,921.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,857.45 : 213,719.46 = 86,892.78 : x
  2. Step 2: Convert to fraction form
    154,857.45/213,719.46 = 86,892.78/x
  3. Step 3: Cross multiply
    154,857.45x = 213,719.46 × 86,892.78
  4. Step 4: Simplify right side
    154,857.45x = 18,570,678,019.50
  5. Step 5: Solve for x
    x = 18,570,678,019.50/154,857.45
  6. Step 6: Final answer
    x = 119,921.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.