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Finding the Fourth Proportional to 421,039.30, 631,601.46 and 136,717.96

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Solution

The fourth proportional to 421,039.30, 631,601.46 and 136,717.96 is: 205,090.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,039.30 : 631,601.46 = 136,717.96 : x
  2. Step 2: Convert to fraction form
    421,039.30/631,601.46 = 136,717.96/x
  3. Step 3: Cross multiply
    421,039.30x = 631,601.46 × 136,717.96
  4. Step 4: Simplify right side
    421,039.30x = 86,351,259,302.62
  5. Step 5: Solve for x
    x = 86,351,259,302.62/421,039.30
  6. Step 6: Final answer
    x = 205,090.74

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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.