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Finding the Fourth Proportional to 515,876.40, 773,814.60 and 389,905.20

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Solution

The fourth proportional to 515,876.40, 773,814.60 and 389,905.20 is: 584,857.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,876.40 : 773,814.60 = 389,905.20 : x
  2. Step 2: Convert to fraction form
    515,876.40/773,814.60 = 389,905.20/x
  3. Step 3: Cross multiply
    515,876.40x = 773,814.60 × 389,905.20
  4. Step 4: Simplify right side
    515,876.40x = 301,714,336,375.92
  5. Step 5: Solve for x
    x = 301,714,336,375.92/515,876.40
  6. Step 6: Final answer
    x = 584,857.80

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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.