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Finding the Fourth Proportional to 619,995.94, 855,687.78 and 378,418.90

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Solution

The fourth proportional to 619,995.94, 855,687.78 and 378,418.90 is: 522,275.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,995.94 : 855,687.78 = 378,418.90 : x
  2. Step 2: Convert to fraction form
    619,995.94/855,687.78 = 378,418.90/x
  3. Step 3: Cross multiply
    619,995.94x = 855,687.78 × 378,418.90
  4. Step 4: Simplify right side
    619,995.94x = 323,808,428,451.04
  5. Step 5: Solve for x
    x = 323,808,428,451.04/619,995.94
  6. Step 6: Final answer
    x = 522,275.08

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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.