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Finding the Fourth Proportional to 811,930.40, 1,218,068.40 and 251,021.60

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Solution

The fourth proportional to 811,930.40, 1,218,068.40 and 251,021.60 is: 376,585.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,930.40 : 1,218,068.40 = 251,021.60 : x
  2. Step 2: Convert to fraction form
    811,930.40/1,218,068.40 = 251,021.60/x
  3. Step 3: Cross multiply
    811,930.40x = 1,218,068.40 × 251,021.60
  4. Step 4: Simplify right side
    811,930.40x = 305,761,478,677.44
  5. Step 5: Solve for x
    x = 305,761,478,677.44/811,930.40
  6. Step 6: Final answer
    x = 376,585.82

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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.