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Finding the Fourth Proportional to 323,776.82, 485,630.40 and 87,143.42

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Solution

The fourth proportional to 323,776.82, 485,630.40 and 87,143.42 is: 130,705.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,776.82 : 485,630.40 = 87,143.42 : x
  2. Step 2: Convert to fraction form
    323,776.82/485,630.40 = 87,143.42/x
  3. Step 3: Cross multiply
    323,776.82x = 485,630.40 × 87,143.42
  4. Step 4: Simplify right side
    323,776.82x = 42,319,493,911.97
  5. Step 5: Solve for x
    x = 42,319,493,911.97/323,776.82
  6. Step 6: Final answer
    x = 130,705.76

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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.