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Finding the Fourth Proportional to 485,676.80, 669,944.40 and 378,076.40

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Solution

The fourth proportional to 485,676.80, 669,944.40 and 378,076.40 is: 521,520.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,676.80 : 669,944.40 = 378,076.40 : x
  2. Step 2: Convert to fraction form
    485,676.80/669,944.40 = 378,076.40/x
  3. Step 3: Cross multiply
    485,676.80x = 669,944.40 × 378,076.40
  4. Step 4: Simplify right side
    485,676.80x = 253,290,166,952.16
  5. Step 5: Solve for x
    x = 253,290,166,952.16/485,676.80
  6. Step 6: Final answer
    x = 521,520.00

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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.