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Finding the Fourth Proportional to 491,439.43, 678,395.68 and 330,387.89

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Solution

The fourth proportional to 491,439.43, 678,395.68 and 330,387.89 is: 456,075.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,439.43 : 678,395.68 = 330,387.89 : x
  2. Step 2: Convert to fraction form
    491,439.43/678,395.68 = 330,387.89/x
  3. Step 3: Cross multiply
    491,439.43x = 678,395.68 × 330,387.89
  4. Step 4: Simplify right side
    491,439.43x = 224,133,713,082.37
  5. Step 5: Solve for x
    x = 224,133,713,082.37/491,439.43
  6. Step 6: Final answer
    x = 456,075.97

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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.