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Finding the Fourth Proportional to 639,138.84, 958,637.42 and 228,791.90

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Solution

The fourth proportional to 639,138.84, 958,637.42 and 228,791.90 is: 343,162.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,138.84 : 958,637.42 = 228,791.90 : x
  2. Step 2: Convert to fraction form
    639,138.84/958,637.42 = 228,791.90/x
  3. Step 3: Cross multiply
    639,138.84x = 958,637.42 × 228,791.90
  4. Step 4: Simplify right side
    639,138.84x = 219,328,471,653.72
  5. Step 5: Solve for x
    x = 219,328,471,653.72/639,138.84
  6. Step 6: Final answer
    x = 343,162.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.