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Finding the Fourth Proportional to 257,938.80, 387,121.40 and 131,672.32

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Solution

The fourth proportional to 257,938.80, 387,121.40 and 131,672.32 is: 197,617.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,938.80 : 387,121.40 = 131,672.32 : x
  2. Step 2: Convert to fraction form
    257,938.80/387,121.40 = 131,672.32/x
  3. Step 3: Cross multiply
    257,938.80x = 387,121.40 × 131,672.32
  4. Step 4: Simplify right side
    257,938.80x = 50,973,172,859.65
  5. Step 5: Solve for x
    x = 50,973,172,859.65/257,938.80
  6. Step 6: Final answer
    x = 197,617.31

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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.