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Finding the Fourth Proportional to 431,803.60, 647,705.40 and 312,917.20

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Solution

The fourth proportional to 431,803.60, 647,705.40 and 312,917.20 is: 469,375.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,803.60 : 647,705.40 = 312,917.20 : x
  2. Step 2: Convert to fraction form
    431,803.60/647,705.40 = 312,917.20/x
  3. Step 3: Cross multiply
    431,803.60x = 647,705.40 × 312,917.20
  4. Step 4: Simplify right side
    431,803.60x = 202,678,160,192.88
  5. Step 5: Solve for x
    x = 202,678,160,192.88/431,803.60
  6. Step 6: Final answer
    x = 469,375.80

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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.