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Finding the Fourth Proportional to 455,638.72, 628,778.92 and 251,703.64

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Solution

The fourth proportional to 455,638.72, 628,778.92 and 251,703.64 is: 347,349.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,638.72 : 628,778.92 = 251,703.64 : x
  2. Step 2: Convert to fraction form
    455,638.72/628,778.92 = 251,703.64/x
  3. Step 3: Cross multiply
    455,638.72x = 628,778.92 × 251,703.64
  4. Step 4: Simplify right side
    455,638.72x = 158,265,942,919.27
  5. Step 5: Solve for x
    x = 158,265,942,919.27/455,638.72
  6. Step 6: Final answer
    x = 347,349.63

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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.