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Finding the Fourth Proportional to 257,936.80, 387,118.40 and 131,670.32

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Solution

The fourth proportional to 257,936.80, 387,118.40 and 131,670.32 is: 197,614.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,936.80 : 387,118.40 = 131,670.32 : x
  2. Step 2: Convert to fraction form
    257,936.80/387,118.40 = 131,670.32/x
  3. Step 3: Cross multiply
    257,936.80x = 387,118.40 × 131,670.32
  4. Step 4: Simplify right side
    257,936.80x = 50,972,003,605.89
  5. Step 5: Solve for x
    x = 50,972,003,605.89/257,936.80
  6. Step 6: Final answer
    x = 197,614.31

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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.