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Finding the Fourth Proportional to 258,464.72, 387,696.60 and 80,985.32

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Solution

The fourth proportional to 258,464.72, 387,696.60 and 80,985.32 is: 121,477.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,464.72 : 387,696.60 = 80,985.32 : x
  2. Step 2: Convert to fraction form
    258,464.72/387,696.60 = 80,985.32/x
  3. Step 3: Cross multiply
    258,464.72x = 387,696.60 × 80,985.32
  4. Step 4: Simplify right side
    258,464.72x = 31,397,733,213.91
  5. Step 5: Solve for x
    x = 31,397,733,213.91/258,464.72
  6. Step 6: Final answer
    x = 121,477.83

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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.