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Finding the Fourth Proportional to 186,658.40, 279,914.80 and 81,405.60

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Solution

The fourth proportional to 186,658.40, 279,914.80 and 81,405.60 is: 122,076.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    186,658.40 : 279,914.80 = 81,405.60 : x
  2. Step 2: Convert to fraction form
    186,658.40/279,914.80 = 81,405.60/x
  3. Step 3: Cross multiply
    186,658.40x = 279,914.80 × 81,405.60
  4. Step 4: Simplify right side
    186,658.40x = 22,786,632,242.88
  5. Step 5: Solve for x
    x = 22,786,632,242.88/186,658.40
  6. Step 6: Final answer
    x = 122,076.65

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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.