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Finding the Fourth Proportional to 136,818.72, 188,793.18 and 76,392.72

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Solution

The fourth proportional to 136,818.72, 188,793.18 and 76,392.72 is: 105,412.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,818.72 : 188,793.18 = 76,392.72 : x
  2. Step 2: Convert to fraction form
    136,818.72/188,793.18 = 76,392.72/x
  3. Step 3: Cross multiply
    136,818.72x = 188,793.18 × 76,392.72
  4. Step 4: Simplify right side
    136,818.72x = 14,422,424,537.65
  5. Step 5: Solve for x
    x = 14,422,424,537.65/136,818.72
  6. Step 6: Final answer
    x = 105,412.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.