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Finding the Fourth Proportional to 323,618.72, 485,427.66 and 86,961.40

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Solution

The fourth proportional to 323,618.72, 485,427.66 and 86,961.40 is: 130,441.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,618.72 : 485,427.66 = 86,961.40 : x
  2. Step 2: Convert to fraction form
    323,618.72/485,427.66 = 86,961.40/x
  3. Step 3: Cross multiply
    323,618.72x = 485,427.66 × 86,961.40
  4. Step 4: Simplify right side
    323,618.72x = 42,213,467,372.65
  5. Step 5: Solve for x
    x = 42,213,467,372.65/323,618.72
  6. Step 6: Final answer
    x = 130,441.98

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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.