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Finding the Fourth Proportional to 393,685.04, 590,621.20 and 127,445.60

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Solution

The fourth proportional to 393,685.04, 590,621.20 and 127,445.60 is: 191,198.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,685.04 : 590,621.20 = 127,445.60 : x
  2. Step 2: Convert to fraction form
    393,685.04/590,621.20 = 127,445.60/x
  3. Step 3: Cross multiply
    393,685.04x = 590,621.20 × 127,445.60
  4. Step 4: Simplify right side
    393,685.04x = 75,272,073,206.72
  5. Step 5: Solve for x
    x = 75,272,073,206.72/393,685.04
  6. Step 6: Final answer
    x = 191,198.71

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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.