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Finding the Fourth Proportional to 666,940.80, 920,494.56 and 395,161.68

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Solution

The fourth proportional to 666,940.80, 920,494.56 and 395,161.68 is: 545,392.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,940.80 : 920,494.56 = 395,161.68 : x
  2. Step 2: Convert to fraction form
    666,940.80/920,494.56 = 395,161.68/x
  3. Step 3: Cross multiply
    666,940.80x = 920,494.56 × 395,161.68
  4. Step 4: Simplify right side
    666,940.80x = 363,744,176,760.46
  5. Step 5: Solve for x
    x = 363,744,176,760.46/666,940.80
  6. Step 6: Final answer
    x = 545,392.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.