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Finding the Fourth Proportional to 398,431.20, 597,646.80 and 149,080.80

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Solution

The fourth proportional to 398,431.20, 597,646.80 and 149,080.80 is: 223,621.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,431.20 : 597,646.80 = 149,080.80 : x
  2. Step 2: Convert to fraction form
    398,431.20/597,646.80 = 149,080.80/x
  3. Step 3: Cross multiply
    398,431.20x = 597,646.80 × 149,080.80
  4. Step 4: Simplify right side
    398,431.20x = 89,097,663,061.44
  5. Step 5: Solve for x
    x = 89,097,663,061.44/398,431.20
  6. Step 6: Final answer
    x = 223,621.20

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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.