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Finding the Fourth Proportional to 645,676.56, 891,029.43 and 355,305.87

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Solution

The fourth proportional to 645,676.56, 891,029.43 and 355,305.87 is: 490,319.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,676.56 : 891,029.43 = 355,305.87 : x
  2. Step 2: Convert to fraction form
    645,676.56/891,029.43 = 355,305.87/x
  3. Step 3: Cross multiply
    645,676.56x = 891,029.43 × 355,305.87
  4. Step 4: Simplify right side
    645,676.56x = 316,587,986,821.75
  5. Step 5: Solve for x
    x = 316,587,986,821.75/645,676.56
  6. Step 6: Final answer
    x = 490,319.78

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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.