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Finding the Fourth Proportional to 421,087.78, 631,563.89 and 117,489.79

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Solution

The fourth proportional to 421,087.78, 631,563.89 and 117,489.79 is: 176,215.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,087.78 : 631,563.89 = 117,489.79 : x
  2. Step 2: Convert to fraction form
    421,087.78/631,563.89 = 117,489.79/x
  3. Step 3: Cross multiply
    421,087.78x = 631,563.89 × 117,489.79
  4. Step 4: Simplify right side
    421,087.78x = 74,202,309,009.69
  5. Step 5: Solve for x
    x = 74,202,309,009.69/421,087.78
  6. Step 6: Final answer
    x = 176,215.77

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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.