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Finding the Fourth Proportional to 421,229.70, 631,844.55 and 261,797.40

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Solution

The fourth proportional to 421,229.70, 631,844.55 and 261,797.40 is: 392,696.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,229.70 : 631,844.55 = 261,797.40 : x
  2. Step 2: Convert to fraction form
    421,229.70/631,844.55 = 261,797.40/x
  3. Step 3: Cross multiply
    421,229.70x = 631,844.55 × 261,797.40
  4. Step 4: Simplify right side
    421,229.70x = 165,415,260,394.17
  5. Step 5: Solve for x
    x = 165,415,260,394.17/421,229.70
  6. Step 6: Final answer
    x = 392,696.10

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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.