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Finding the Fourth Proportional to 431,999.70, 647,999.55 and 210,815.70

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Solution

The fourth proportional to 431,999.70, 647,999.55 and 210,815.70 is: 316,223.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,999.70 : 647,999.55 = 210,815.70 : x
  2. Step 2: Convert to fraction form
    431,999.70/647,999.55 = 210,815.70/x
  3. Step 3: Cross multiply
    431,999.70x = 647,999.55 × 210,815.70
  4. Step 4: Simplify right side
    431,999.70x = 136,608,478,732.94
  5. Step 5: Solve for x
    x = 136,608,478,732.94/431,999.70
  6. Step 6: Final answer
    x = 316,223.55

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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.